0hour:
As in 0hour access to a release. Means someone has access to a release within an hour after it was pred.

0day [1]:
As in 0day access to a release. Means someone has access to a release within a day after it was pred.

0day [2]:
As in 0day which refers to software, videos, music, or information released or obtained on the day of public release.

1080i:
The number 1080 stands for 1080 lines of vertical resolution, while the letter i stands for interlaced or non-progressive scan. 1080i is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1920 pixels and a frame resolution of 1920 × 1080 or about 2.07 million pixels, and a field resolution of 1920 × 1080 / 2 (because it's interlaced) or about 1.04 million pixels. The field rate (not the frame rate) in hertz can be either implied by the context or specified after the letter i.

1080p:
The number 1080 stands for 1080 lines of vertical resolution, while the letter p stands for progressive scan or non-interlaced. 1080p is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1920 dots across and a frame resolution of 1920 × 1080 or about 2.07 million pixels. The frame rate in hertz can be either implied by the context or specified after the letter p (such as 1080p30, meaning 30 frames per second).

1337:
Leetspeak (1337) is a digital language used by gamers but it's also in the scene.

256MS, 512MS, 1GB and 2GB:
These tags only apply to PSP releases, and they show the required size of an UMD disc. UMD discs can contain up to 2 gigabytes. When a game is 100mb it fits on every UMD disc, but when a game is 900mb it will only fit on 1GB and higher UMD discs.

480i:
The number 480 stands for 480 lines of vertical resolution, while the letter i stands for interlaced or non-progressive scan. 480i is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 640 pixels and a frame resolution of 640 × 480 or about 30.700 pixels, and a field resolution of 640 × 480 / 2 (because it's interlaced) or about 15.400 million pixels. The field rate (not the frame rate) in hertz can be either implied by the context or specified after the letter i.

480p:
The number 480 stands for 480 lines of vertical resolution, while the letter p stands for progressive scan or non-interlaced. 480p is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 720 dots across and a frame resolution of 720 × 480 or about 345600 pixels. The frame rate in hertz can be either implied by the context or specified after the letter p (such as 480p30, meaning 30 frames per second).

576i:
The number 576 stands for 576 lines of vertical resolution, while the letter i stands for interlaced or non-progressive scan. 576i is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 720 pixels and a frame resolution of 720 × 576 or about 414720 pixels, and a field resolution of 720 × 576 / 2 (because it's interlaced) or about 20.000 million pixels. The field rate (not the frame rate) in hertz can be either implied by the context or specified after the letter i.

576p:
The number 576 stands for 576 lines of vertical resolution, while the letter p stands for progressive scan or non-interlaced. 576p is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 720 dots across and a frame resolution of 720 × 576 or about 414720 pixels. The frame rate in hertz can be either implied by the context or specified after the letter p (such as 576p25, meaning 25 frames per second).

720p:
The number 720 stands for 720 lines of vertical resolution, while the letter p stands for progressive scan or non-interlaced. 720p is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1280 dots across and a frame resolution of 1280 × 720 or about 0.92 million pixels. The frame rate in hertz can be either implied by the context or specified after the letter p (such as 720p30, meaning 30 frames per second).