gb2b 

go back to bed

Christian- hey man I think that maybe I'm in to penguin sex now
Elliot-dude, are you sleep walking? It's 5 in the morning, gb2b

gb2b by yourmomsoldunderwear January 22, 2011

gb2/b 

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.

Fucking furries! gb2/b

gb2/b by Mel December 21, 2004

Gb2 /b/ 

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