Vader Doming 

The act of penetrating someones anus using your head whilst wearing a Darth Vader Helmet.

Kerry was shocked to hear Briony request a Vader Doming session.

Vader Doming by B-Queef March 7, 2010

Doing the Darth Vader 

When a man or woman with a c-pap mask on gives you oral pleasure.

This fat sweaty c-pap wearer is doing the darth vader on my ex wife

Doing the Darth Vader by Sneakypineapple April 7, 2017