To put your foot in it, doing something stupid or make a mistake
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!
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a gaff is a term used when someone is having a party, or a sesh.
christine is having a gaff next weekend, you coming?
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v. (theatrical) to tape down out of harm's way, as in electrical cords, audio cables etc.
"Gaff these down across this doorway"
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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...
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Grab Ass From Front
To grab someone's ass from the front.
Hey did you gaff Megan yet?
Shit man she loves it when I gaff her.
I gaffed her for two and a half hours.
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