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A woman's oversize buttocks.
Maria's pants are way too tight for her slugbutt.

That woman has such a big slugbutt I could rest my drink on it!
slugbutt by Stefen S. July 16, 2006
Related Words

slutbutter 

once again, the true definition of "slutbutter" is: the warm, pasty(possibly chunky) secretion from the vagina of a woman who is sexually promiscuous.
After having sex with Michelle, i was forced to use bleach to clean the "slutbutter" off my penis.
slutbutter by Marc Micheline January 22, 2005
a hoe, a nasty bitch that cheats on her man, sleeps around, and deserves to get her ovaries carved out with a scalpel
you are a slutbutt, so shut the fuck up. keep your mouth shut. slut what the fuck!
slutbutt by SUCKMY DICKBITCH October 29, 2009

slutbutter 

vaginal excrement from an overactive female
While I was down on Michelle I got a wiff of the slutbutter and almost puked.
slutbutter by Marc Micheline February 10, 2005
usually defined as a male friend who hits on younger women becuz he feels cool and doesnt get rejected that way
"is that travis with another freshman?!?!?! wat a fucking slutbutt"
slutbutt by batman t money September 2, 2006
When a girl has a tattoo on he lower back just above the butt.
Have you seen megan's new slutbutt ?
Slutbutt by The Original Will I Am January 31, 2010