Primarily used by scousers(citizens of Liverpool), to describe a gathering in which friends come together to consume drugs.
by LBM123456 March 18, 2022

by M889 June 11, 2018

To knock one out on to a piece of cloth - in most cases a hankerchief - roll it up and hide it under the bed covers.
Guy: hey, why you late today? Been waiting for ages...
Friend: Sorry man, had to blow the gaff first.
Guy: Did you wash your hands?
Friend: Sorry man, had to blow the gaff first.
Guy: Did you wash your hands?
by Crazy Meka September 16, 2009

The phenomenon when you come home from a gaff (house party) or a night out and you feel the drink starting to hit you.
by Polomint2001 December 24, 2022

When a person intraveniously injects meth and the rush is so intense it causes the person to instantly cough. Hense, the coughing is known as the gaff.
by MerryChrismeth April 24, 2010

when you and all your mates go to a gaff (a house party) and fuck the house up by doing weird shit like putting bananas in lights and sriracha in the knife holder
by blackcurrantsoda April 21, 2018
