look up any word, like sex:
The bigmac slap is where you get a morbidly obese person to eat 5 Bigmacs and then to slap his man tits continuously on a womans face.
Dude, I saw this huge motherfucker last night. I hit him up for Mcdonalds and had a wonderful night of Bigmac slaps.
by i.like.your.mum July 24, 2009