Mackeral Fart
A gasous odor omitting from either a human or dog's anus that combines the smell of typical anal glands, with the raunchous smell of a bloody mackeral laid out for days in the back of a boat.
Damn, have you been by Merle's office recently? Makes me want to puke on a mackeral every time I walk by. That guy is laying mackeral farts down left and right.