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A streak of shit left in the back of the underpants. Usually caused by an overfilled colon during some type of physical activity.
After returning home from a long bike ride, Mary noticed gleasters in her panties as she was preparing to shower.

It seemed that every pair of underpants in the hamper had gleasters, making the job of laundry quite distasteful.

Noting that John had gleasters in the back of his underwear, Sally chose not to perform analingus on him during foreplay.

My god, you seem eat like every meal is like your last meal. I'll bet every pair of your underpants has gleasters.
by jrquixote December 09, 2006
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