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A disgustingly ugly woman who by virtue of her appearance is guaranteed not to be the mother of any children. One who is so slobberish and vile that her very presence can be sensed by all but the most comatosed individuals who deserve an encounter with such a filthy beast. Usually found in shopping centres, clubs, pubs, zoos and abattoirs. The criteria for what constitutes a mulper can often be relaxed and the term can apply to even a mild ugly woman who might be carrying a few extra kilos, or anyone in between.
Look at that hideous mulper walking down the street at the Fringe.

Nearly succumbed to the advances of a filthy mulper last night . Fuck it was close.

There should be a law against mulpers like that. Enough to put you off your pint.
Mulper by chemischen March 15, 2011
Related Words

Mulderbed 

A substitute for a bed, such as a couch, chair, or patch of floor; this terms originates, of course, with special agent Fox Mulder's distaste for traditional beds.
"Hey, man, I heard your bed was broken. Maybe sleeping with the fat lady from a sideshow was a bad idea, huh?"
"It's okay. I've got a Mulderbed... and my forbidden love."
Mulderbed by J. Severn February 21, 2005

fox mulder 

contrary to what some other guy said here on UD, the great Fox Mulder was nicknamed "spooky".

yep.
" Man: Are you familiar with an agent named Fox Mulder?
Scully: Yes, I am.
Man: How so?
Scully: By reputation. He's an Oxford-educated psychologist, who wrote a monograph on serial killers and the occult that helped catch Monty Props in 1988. Generally thought of as the best analyst in the violent crimes section... He had a nickname at the academy... Spooky Mulder."

so next time, before you defining shit, make sure you're right, huh? cunt.
fox mulder by OOIOO January 4, 2007

mulherin 

A relatively popular surname of Irish origins. Only really hot people have this surname.
Girl: Oh my god is that Andrew?? I haven’t seen him since high school! He’s so hot now!

Girl’s Friend: Well duh! He’s a Mulherin!
mulherin by howstheweather18 March 7, 2020

Muller cornered 

When the painters are in but your girlfriend can't resist the urge for some love yoghurt, and the outcome resembles a stirred-up strawberry Muller Corner.
Susan: "Not tonight I'm afraid, I've already had to change my knickers three times today"
Clive: "Can I just stick it in anyway?"
Susan: "Fine, but don't forget the mess you made when you Muller cornered me last time!"
Muller cornered by mylittlewhiteslug September 20, 2018

Muldered 

When a guy says he will get you a beer and doesn't; When said person says he "forgot his wallet"; When said person sleeps on your couch.
Man, we went to White Castle last night and he "muldered" me.