look up any word, like blumpkin:
 
1.
Adjective/Verb

Used to describe, or to refer to any form of general laddish, outlandish or outrageous behaviour, or to show one's intentions of exhibiting such behaviour.

Can also be shortened to the acronym - GITBO (pronounced GIT-BO)
"Dom is looking forward to giving it the big one at Neil's stag do this weekend."
by Lavisse December 26, 2010