Jetpacking

Fucking a tubby girl's backfat while she brings her arms in and flexes her lats (AKA jetpack position).

Emma bragged to her classmates that Wyatt had a good time jetpacking her in a tree house last evening.

RBI

RBI = Respectfully, boner inducing. The most polite way to compliment a person's hotness.

Hey Shani, and I say this with love, your mom is RBI. She's a fantastic MILF.