Receiving oral sex while operating a jet ski or wave runner.
I hope Sean Kingston was getting wave head when he crashed into that bridge.
(n.) engaging in oral sex while driving a water vehicle of some kind. Includes motorboats (inboard & outboard, of course), sailboats, jet skis, wave runners, small skiffs, rowboats, surfboards, and the occasional boogie board.
"Dude! My girlfriend just gave me the best wave head ever! We were flyin' down the lake and it was such a high!"