Top Definition
1. Slang term, an idiot, nincompoop, lacking common sense. 2. An indolent person. 3. A cross between nincompoop and jackass.
1. Get back to work you jack-a-ninny!
2. Al is a frickin jack-a-ninny.
by Hoyt of The Ledge May 20, 2006
Massachusetts drivers who have no right to have a drivers' license, usually preceded by various 4 letter words
look at that bleepin' jackaninny who just blew by doing 90 in a 55
by wordlover81 February 07, 2010

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