n; One who motorboats --
n; Term applied to one who puts there head in between a females breast, moves there head side to side makeing a motor boat sound.
Did you see the rack on that girl that I was motorboatin?
I was motorboatin that hot stripper last night.
n; Term applied to one who has had a sexual episode whilst intoxicated -- usually followed by high fives and busting of chops.
Person 1: Yeah so I was totally nailin that girl last night! Cool.
Person 2: I bet you were, you motorboatin son of a bitch!
Hey did you hear about Seamus? He got with that girl Kerri -- what a motorboatin son of a bitch huh?!