The Dunkin Donut 

A sex act in a bathroom stall involving a standing doggy-style posistion. When at the point of ejaculation you dunk your partner's head in the toilet and flush while at the same time cumming in a circle around the partner's anus.

Tina didn't appreciate me getting her hair wet. I don't know why she is so upset though. Hadn't she ever had The Dunkin Donut before?

The Dunkin Donut by More Hank than Henry July 2, 2007

The Dunkin' Donut 

A sexual position that is best performed in a bathroom stall. The receiving partner is bent over the toilet while the giver is positioned directly behind. At the point of climax, the giver dunks their partner's head in the toilet and gives it a flush while simultaneously pulling out and ejaculating in a circle around the anus aka the donut hole. The end result is the dunkin' donut.

Herb took some skank to the can he met at happy hour and that old dog gave her the dunkin' donut.

The Dunkin' Donut by Coach Mike K August 16, 2007

dunking the cosmic donut 

A sexual position referenced in by Wendy the Android in the TV show Dark Matter. It is likely a move that relies on the contortion ability of a sex android, whereby the android would backbend into a complete circle while allowing the partner to insert themselves as they are standing or laying intercepted to the formed circle.

Hi Wendy, I would like to try dunking the cosmic donut when you aren't preparing meals on the ship.

dunking the cosmic donut by politicalmess December 14, 2015