Top Definition
Great Big Raunchy Box -- when a female has not cleaned her box in over 24 hours.
Hey, Laquisha got mad when I wouldn't go down on her last night cause she had GBRB -- don't think she bathed since she did Tyrone.
by Shanana O'Connor January 09, 2011
1 more definition
5 Words related to GBRB
When you say you will be right back, but then it takes you over an hour.
Hey guys I'll be right back...

*2 hours later*

Whoa, I'm still on here?
by Big Dizzle April 14, 2005

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