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1.
its a sex gesture where you think ur fucking your girlfriend... but ur really fucking ur grandma....

originated: cooper b
Cooper: DUDE i was with my girlfriend last night and we were doing it, but then i looked down

Trenton: AND IT WAS YOUR GRANDMA

Cooper: THE BIG SURPRISE

Trenton: OMG THE BIG SURPRISE
by eagermcbeaver October 20, 2010
14 4

Words related to the big surprise:

grandma
 
2.
Its when your fucking a girl and you look down... AND ITS YOUR GRANDMA!!!!
Guy 1: *fap fap fap fap* "Ah damn girl hell yeah... AH FUCK ITS MY GRANDMA!!!!"

Guy 2: Damn thats quite the big surprise!
by Mrdriller6969 October 20, 2010
11 1