Top Definition
When you fail to thourally wash the head of your dick slit after having sex and replace your underwear. A slit slug occurs overnight and shows itself when you try to remove your dick from your boxers to take the first pee of the day and discover that your member is stuck to your underwear.
"I have to start wearing silk underwear," Jim yelled after a slit slug ripped an 1/4 inch hole in his dick slit.
by HR856 November 07, 2007
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