buttercoaster

(n,v) To rely on pumping inertia to stay hard after ejaculation. This is to allow for a partner to climax if they have not, or to achieve multiple orgasms.

"Dude last night I blew before your mom, so I let her ride the buttercoaster for a while."

"I had to buttercoaster that chick for an hour before she finished."

"Buttercoastered!"