tumble bug 

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.

tumble bug by redrocket84 May 9, 2011

tumble bug 

A ride at luna park

Let's ride the tango train! No, let's ride the tumble bug!

tumble bug by Brooke hayes 4ever21 July 30, 2016