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

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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

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt