1 definition by Triple U

short for (G)o (B)low (Y)ourself,
either A: term of disbelief B: insulting way of asking a person to go away.
A: Yo,last naight I gots me some lips from tha sw33t3st b1tch.
- o_0 NW!! GBY
B: excuse me, could you adress me to the nearest poetry forum?
- GBY, damn be4tnick!!
by Triple U January 8, 2005
Get the GBY mug.