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1.
Someone always making feeble wisecracks, who laughs at his/her own jokes and is generally deserving of severe and painful punishment.
That guy is up there thinking we are all listening to his puerile crap, such a wisenheimer.
door sevenhn 17 februari 2006
 
2.
Someone who makes smart aleck, sarcastic comments, often at inappropriate times and usually at someone else's expense.
"Don't smart off to your mother, you little wisenheimer."
door JDunning 12 januari 2009
 
3.
a wise ass, generally a nebbish male trying to get over with a humorous, but usually feeble attempt to make someone else the butt of the joke. Wisenhemiers are usually called out and decsribed as such.
youz a f'in wisenheimer and you're gonna end up wit yer dick in yer mouth.
door snappy's 2 februari 2008