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fort mac hack 

To expel air and bitumen from the lungs suddenly and noisily, often to keep the respiratory passages free of irritating material.
Tammy: Oorf! Horf! Aorfff!
Roddy: Is she dieing?
Abe: No, that's just the Fort Mac Hack.
Tammy: My breath registers at 87 octane.
fort mac hack by M DOGG July 29, 2005

Fort Mac Foreplay 

When you and a member of opposite sex work on the same greasy mechanical project before hooking up. Mingling the same greasy hands on one anothers body.
When you leave a hand print on her ass after a little Fort Mac Foreplay, it's not red from snacking it. It's black.