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1.
Completely annoying, detestable strain of human species. Mentally hindered to a point of retardation. Also used to express dismay at yourself, if you did something totally out of character, or just being outrightly stupid.
"Oh shit, I'm such a fuckwart, I left my keys in my car again!"
"That guy who tripped over his gran is such a fuckwart!"
by Swishfok August 15, 2012