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Mark - His name on the register is William, so why does he gets called Bill?

Charlie - Cos Bill is short for William!

Mark - Aww no, I just done a Gaff!
by The Coltness Killa October 16, 2009
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30
Underwear used by trannys to conceal their man junk
That tranny's gaff is so good it looks like he/she has a vagina.
by ThomasPhillip April 25, 2007
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31
Someone who sits in the background and laughs at everything that everyone says in a group conversation without contributing to anything that anyone says but giggling and smirking like a nonce.
Brian: Oi Mike, D'you mind if I bring Adam to on Friday?...
Mike: If you want but he's just a gaff. Doesn't say anything...
by Yorkshire pudding December 13, 2017
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32
a gaff is a term used when someone is having a party, or a sesh.
christine is having a gaff next weekend, you coming?
by sesh lord December 28, 2016
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33
v. (theatrical) to tape down out of harm's way, as in electrical cords, audio cables etc.
"Gaff these down across this doorway"
by voodooelectronics July 19, 2006
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