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1.
1) A particularly unfriendly woman.

2) An extraordinarily promiscuous woman who chooses not to practice safe sex and may possess various STD's.
"Dude, did you hear Angela giving me shit earlier? What a total sludgecunt."

"Seriously dude, stay away from that one. What a sludgecunt."
by SteveHeartsZombies August 12, 2012
 
2.
When a person is being lazy, bitchy, and hasn't showered for at least a week.
Bro1: "Dude Matt must be on his man-period...and he smells horrible"

Bro2: "Yeah...He's being such a sludge cunt"
by ncboy421 June 02, 2011