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1.
A combination of pubic hair and cotton lint, that becomes intertwined after swamp-butt and walking create optimum conditions.

Not like a dingle berry, whose main component is fecal matter, crusted onto pubic hair(s).

(see dingle berry )
I usually find 2 or 3 tumble bugs in my underpants by the end of the day.
by redrocket84 April 19, 2011