What is Ass Nast?
1.
The nasty, scumy, build up of sweat, crusted feces and other various substances in and around one's anus. Usually an indicator of uncleanliness and/or failure to correctly wipe one's rectum after defecation.
"Frank you need to wipe man, I smell that ass nast from all the way over here!"
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1.
To start a relationship that has a defined end date; e.g., one of the people is moving soon.
"I hear you started dating some new g..