fisttonuts

When your getting a blow job and right as your coming the blower punches you in the balls repeatedly, speedbag style, while sucking you off to completion.

Bro #1 - I was at Gina's and she went fisttonuts on my balls right as I was coming.

Bro #2 - Damn. How was it?
Bro #1 - Great at first and then not.