grandad 

A older gentleman. Often a postman called Kevin

Kevin you are such a grandad

grandad by Chicken83 April 8, 2007

Grandad 

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!"

Grandad by Frankoyo December 2, 2013

grandad 

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!!"

grandad by The Mongo Collective January 14, 2008

grandad 

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'!!!!!

grandad by Mikey November 8, 2004

Grandad 

When you hand a printed dick pic to a woman.

I was at the bar and some old guy grandadded me....so many gray pubes🙄

Grandad by Steelbeast November 1, 2020

Grandad 

Pervy old man who taps girls on the ass.

me: omg here comes grandad
you: oh fuck.
grandad: hi baby *tap tap*

Grandad by grandads girl LOL January 23, 2009

Grandad 

When you fuck him with a strap on and he yells his grandads name.

I dumped him cus he did the grandad.

Grandad by Jimby Bobbinson May 3, 2018