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(noun) (prounced: mom-er) Any mother or mother-in-law who is a complete and utter psychopath.

Derived from the root words Mom and (Jeffery) Dahmer.
Example: Chris' mother-in-law is such a mahmer. She threw away every piece of wrapping paper Chris cut because the edges weren't perfectly straight.
by Chris Nieratko June 19, 2006
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