Someone who is so stupid, annoying, or just plain retarded she might as well be whacked by a hitman to put her out of her misery. Example: Did you see that moron wet her pants? She musta studied extra hard to be such a wackjob.
WACKJOB
Meaning of WACKJOB in English
Slang English vocab. Английский сленговый словарь. 2012