Fod- The uk term for forehead
Fod Slap- To slap someones forehead (which can turn into a war of fod slapping)
Best done on randomers walking down the street, then run!
Dude 1: Look at the size of her fod!
Dude 2: Damn That things huge!
Dude 1: I think i'm going to Fod slap that dude over there!