A happenstance in intercourse where the woman is on top of the man, where the rhythmic thrusting causes the woman's breasts (and therefore, nipples) to rotate in a circular pattern, like the twin blades of a chinook helicopter.

To those making sexual definitions about this, you are the most retarded dudes I have ever met. A Chinook is a heavy, dual rotored transport helicopter that has a top speed that is almost 200 MPH. Primary use is to transport infantry and/or vehicles. In Call of duty they have replaced the little bird helicopters for the care package delivery. it is slower and is a bigger target in BO so one can shoot it down and steal the package.

\shə-ˈnu̇k, chə-, -ˈnük\

1. To have sexual intercourse with two pilots simultaneously.

to shank/kill/maul someone, pronounced shinook and said really fast

A sexual technique similar to Helicoptering, in which two men rotate their flaccid penises smacking the recipient in the face.

A rotary winged aircraft (helicopter) produced by Boeing/Vertol, it is very distinctive, having two counter rotating rotors rather than the main rotor/tail rotor setup of most helicopters. A powerful heavy-lifter, the first version introduced during 'nam could carry about six tons, the latest versions (e, f) can carry over twelve. The aircraft is designated CH-47. (CH stands for Cargo Helicopter)

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.

A warm wind that comes in over the Rocky Mountains and melts the snow in Calgary, much to Edmontons chagrin.