Term used among Motocross racers and is when you crash and you get ejected landing head first, usually jamming your neck up pretty good.
*while trying to crank dirt bike after crash*
Rider 1: You ok man ? I saw you lawn dart on tha triple
Rider 2: Yeah I'm good ,how'd it look?
Rider1: Brutal
When a woman lays on the edge of the bed and a man starts at the end of the hall, and gets a running head start, and as soon as he hits the bedroom doorway he jumps and arches his back while grabbing his ankles and sticks it in and finishes in one foul swoop. It is required to promptly roll over and smoke a cigarette.
The wife let me lawn dart her last night, I think I dislocated my hip.