Top Definition
The difficult to clean out mixture of semen, feces, and lubricant remaining in one's rectum after anal sex that stays even after multiple bowel movements. May be expunged with an enema or further bowel movements.
Noun:

1. God damn, Cody, this ass phlegm just don't stop. I think I need a bong-water enema.

2. Man, this button lighter is pure ass phlegm compared to my trusty Bics that my shithead friends keep pocketing.

Exclaimation:

1. Fucking ass phlegm! I just dropped my bong filter down the sink!
by ukohaK May 15, 2014

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