A butt slug is a slow moving, small piece of poop that takes forever to force out. It leaves your ass as fast as a slug would...very slowly. It can sometimes look slimy in the water and leave a trail on the toilet when flushed. Unfortunately, when you pour salt on a butt slug, it does not melt.
An example of a butt slug would be a small, slow moving piece of slimy poop that takes forever to force out and leaves a trail on the toilet when flushed.
by The Great Bmac of the 215 September 24, 2008
a guy who likes to have anal sex (in gay guys, he'd rather be the butch, not the bitch)
My boyfriend is SUCH a butt slug!
by Blonde420^_^ February 23, 2008

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