Verb: Sexual intercourse with a flying vehicle filled with a lighter than air gas. (zeppelins, dirigibles, and of course blimps)
Jonathan loved his blimp, Humphrey. He wanted take the next step and engage in blimp sex with his beloved.
Two obese specimens of the human race attempting to copulate (have sex). Often hard to recognize in the wild, as identifying body parts under the massive amount of sweaty rolls is very difficult.
Yo, Fat Bastard and Rosanne Barr are having blimp sex.