(verb) To lovelooking at a car so much that you feel that you may just be able to masturbate to it.
Guy 1: what we're you doing for an hour, alone in the garage?
Guy 2: Hmm? Nothing. Just uhh... you know lookin' at my new 67' Shelby...
Guy 1: Eww. Dude. You weren't motorbating to it were you?
Guy 2: No. No! of... course not...
Guy 1: ....Why the fuck do I even hang out with you?
When a woman loves a man enough to drop to her knees and motorboat her significant others testi. This always ends with an ejaculation somewhat similar in scale to a prostate orgasm, only not homosexual.
It means the activity of putting one's face between a woman's breasts, and rocking turning one's head rapidly from side to side while making a noise like a motorboat.
"Put your head between her tits and go bbl bbl bbl bbl bbl..."