when you ejaculate into your hand then go up to someone you know or an authority figure and throw it in their face.

while receiving oral sex fake an orgasm then cum in your hand and throw it over her face when she's not expecting it

to cum into your hand then chuck it at someone, like bird shit
also, if a couple are dogging, or just having sex in a car you wank onto the car so it looks like birds have shit on the car

To spaff on someone from a great height, usually from a tall building.

When dogging, one defecates on to the windscreen of the car that the couple are having sex in.

When guys swarm all over a drunk/single girl at a bar/club/party like seagulls at the beach fighting over scraps of food.