Best definition
Yankee Clipper
A New England sex act in which partners scissor on the back of an in-transit lobster boat.

Amidst the mounds of flailing crustaceans, the lovers embraced in the impassioned form which could only be described as the Yankee Clipper.
Yankee Clipper: define #2
yankee clipper
when an object hits you directly in the nipple.
Dan- I just got hit in the nipple by that box! Racel- Dude! You just got a yankee clipper!