v. The act or result of penetrating a woman with such vigorous upward force that it causes her breasts to rotate rapidly, one clockwise, one counter-clockwise, as if helicopter blades on a Chinook helicopter. The act may be referenced both by the giver and/or the receiver, and is only applicable when employing the cowgirl or reverse cowgirl sexual position.
Dude! Last night I was Chinooking her so hard I thought she was going to fly away!
My tits hurt from all that Chinooking backstage at the Buck Cherry concert!