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A cretin; a moron; a complete and utter idiot. Name come's from the fact that their brain is mushy like sludge. May also be because they're so thick like sludge.
Ejemplo uno:
Person A: Yo, dude, can you help me put these M and M's in alphabetical order, man?
Person B: You can't, you sludgehead.

Ejemplo dos:
Person A: Dude, I'm gonna, like, take class A drugs so I can be popular and ruin my life..but that won't matter, because I'll be popular, dude!
Person B: Urgh...what a sludgehead!
by VCK October 23, 2005
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