F'donk
A guy takes his pecker out of his pants and slaps it on a girl's face like it's a birthday present. The noise it makes is *F'donk*, and it's so loud it wakes up the neighbors.
My neighbor did this to his girlfriend. She threw a pillow at him.
My friend did this to his crush. She turned into a tomato.
A guy at the park did this to a girl. She ran home crying.