The act of completing a blow job by gargling the semen. Often seen as a sign of respect for the wasted sperm being sacrificed for her pleasure.
Sally's a really great chick. She gave me a suck and gargle out of respect for my swimmers.
The idea of grabbing someone's cock (preferably a strangers) filling your mouth with a mixture of salt, pepper and chili flakes and proceeding to gargle their cock viciously until they bust a nut.
Bro I just did the "Dirty Cock Gargle" and I feel great!