The often smelly crease of skin linking the ballsack or labia to the thigh.
Man, I went down on this girl last night and her Grease Trap smelled like McDonald's!
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When one's ballsack dips into the toilet water during defecation; typically an accident, though other cases have been observed.
This morning I was taking a shit and surprised myself with a Low Country Boil! My balls are STILL shriveled up!
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