A older gentleman. Often a postman called Kevin
by Chicken83 April 2, 2007
Get the grandad mug.
An exclamation guaranteed to cause confusion and possible upset, particularly when used during coitus.
Man: "Oh yeah baby.....Mmm hmmm..."

Woman: "Oh yeah, oh yeah, oh yeah...."

Man: "Uh, uh, uh, uh...oh yeah....oh fuck...I'm gonna...I'm gonna...GRANDAD!!!!"

Woman: "WHAT THE FUCK IS WRONG WITH YOU?!?! Get off of me and get the fuck out of my house you sick freak!!"
by The Mongo Collective January 9, 2008
Get the grandad mug.
where somone hits someone else in the area above the kneecap on the side of the left leg with their own knee. why? because its bloody funny (only if it works)!! the consequense of this will be the other person hopping on one leg shouting swear words,while u and ur m8s r laghing like hell. also some advice: always give a grandad when the other person is noot expecting and make sure u r standing up when doing it. there are adaptions of the grandad like a 'running grandad', the 'spinny' and a 'flying grandad'.
'oi m8 i think u'v got a grandad'!!!!!
by Mikey November 8, 2004
Get the grandad mug.
When you absolutely plough the shit out of the side of someone's thigh with your knee, hence named because they will be walking like a grandad for the rest of the day.
"Hey Joffy, if you don't pass me a beer I'm gonna grandad the living shit out of you!"
by Frankoyo December 2, 2013
Get the Grandad mug.
you knee some innocent sole in the thigh
it hurts
and afterwards they walk like a grandad.
this is the concept we all know and love.
hardeep grandaded me yesterday :(
by Charley351 November 4, 2007
Get the grandaded mug.
Pervy old man who taps girls on the ass.
me: omg here comes grandad
you: oh fuck.
grandad: hi baby *tap tap*
by grandads girl LOL January 21, 2009
Get the Grandad mug.
When you fuck him with a strap on and he yells his grandads name.
I dumped him cus he did the grandad.
by Jimby Bobbinson January 23, 2018
Get the Grandad mug.