Term used by the character Elias in the Kevin Smith movie Clerks II. It is a "troll" placed by one's parents in a girl's mouth at a young age in order to prevent open-mouth kissing before the age of 21.

See also: pillow pants
Randal: Have you and Myra even kissed yet?
Elias: We would have already if it wasn't for Listerfiend..
Randal: Listerfiend is her mouth troll, isn't it..
by Hazel K July 24, 2006
a troll that lives in girls mouths so that they cannot kiss, similar to pillow pants (pussy troll), but in the mouth
i would have kissed her by now if it wasn't for that stupid lister fiend!
by listerfiend August 07, 2006

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