Definitions by Lavisse

Giving it the big one 

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."

Giving it the big one by Lavisse December 26, 2010

GITBO 

Acronym of Giving it the big one

Pronounced (GIT-BO)

Look at Chris over there, talking to those three fit birds - GITBO

GITBO by Lavisse December 26, 2010