Mug Jam

A variation of the Blow Job, where one partner lies on their back on a bed (or massage table or baby grand piano) with their head hanging off the edge, mouth agape. The second partner stands bedside and proceeds to penetrate the lying partner’s hanging mouth with their penis and performs a vigorous humping motion, preferably to ejaculation.

Etymology - the standing partner JAMs their penis and balls into the lying partner’s face (i.e. their MUG)

That girl Jessley is a freak. She let me Mug Jam on the first date!

What’s the difference between jelly and jam?
I can’t jelly my dick in your mug.