What is Ball Muck?
1.
A substance that accumulates in tight underwear usually in the summertime from not bathing or changing your underwear for several days. Resembling expired cottage cheese and smelling just as curdled.
I haven't showered in a week and my boxer briefs are full of ball muck.
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Also a famous Stevie Ray Vaughn song, but this event occurs after a long day of drinking margaritas and other alcoholic beverages in Aus..