A chinook occurs when a woman tit-slaps a man in the face, or when a man's face is between two large, round, vuluptuous breasts and decides to shake them side to side.
- Jon B.
Me: aw yeah, got the care package
enemy: *shoots down chinook*
Me: you son of a bitch!
The sound of a chinook is very distinctive, like some enormous jackhammer, a penetrating basso thunder that can be heard miles away, and makes the earth shake when the aircraft passes close by.