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1: An acronym for "GameBreaker 2" from NBA Street Vol. 2, in which an unstoppable team stunt was performed, adding several points to the user's team while taking points away from the user's opponents.

2: an acronym for "go back to", commonly used on 4chan. Usually followed by a letter or word in between two slashes (for example /b/ or /school/), to tell one where to go in the poster's opinion. the two slashes stand for how the letters of 4chan sections are between 2 slashes (like /h/ or /b/), representing how they are shown on the URL.
Example for definition 1:
"Yo! I pulled a phat gb2! Your ass is done!"
Examples for definition 2:
EXAMPLE A
"Futanari doesn't belong on /h/! gb2/d/, n00b!"
EXAMPLE B
"You can't spell worth shit! gb2/school/!"
gb2 by Hand Hanzo June 10, 2005
Related Words
gb2 gb2/ gb2/b Gb2 /b/ GB2AC gb2b gb2ff gb2gbs gb2gp gb2k
Used primarily on 4chan, telling another user to get off of the current board, and to take his thread to another.
Poster 1:OMG luks: Nurse Joy on Officer Jenny! *fap fap fap*

Poster 2: Nub, gb2/u/
gb2/ by The Ivan June 11, 2007
In reference to the internet image board 4Chan, refers to moving a discussion to a certain board on the site. In gb2/b, for instance, the user is telling another user to move a discussion to /b, one of the several boards on the site. This is used when the discussion is completely out of context to a select section's subject matter.
gb2/b by Mel December 21, 2004
A common phrase on 4chan.

When a poster makes a thread on one of 4chan's niche boards that doesn't follow the theme of the board, or makes an incredibly stupid and/or immature (and unfunny) comment (eg: being racist, saging for no good reason, using "your mom") they will be told

by the masses to Go Back To /b/ (or Gb2/b/)
Thread: "This chick (insert picture of black girl here) asks you out on a date, what do you do?"

Anonymous: "LOLNO NIGGERS GOT AIDS"

Other Anon: "Gb2 /b/"
Gb2 /b/ by JFGDS June 3, 2009
A suggestion that the person being addressed or referred to should return to gbs, as their presence is neither desired nor appropriate in their current locale.
gb2gbs kthxbye
gb2gbs by PELE'S PANTIES August 4, 2003
An internet acronym short for "Go Back to Wow".

Used mostly on MMORPG-forums. Used as a hostile term towards people that, for example, suggest Wow-like features or whine about features that are characteristically unlike Wow.
- I think this game needs bigger swords. And more elves. Definitely more elves...
- GB2WOW!