Top Definition
1. A chick so hot she makes superman or you weak in the noggin

2. Something so cool or good that it makes you weak in the noggin (can't think so straight)
i was at this strip club this weekend and there was this babe who without a doubt was kryptonic...too bad she was dumb as a box o rocks
by Big BNP January 29, 2004

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A verb describing anyone who uses their power or authority to make you or your (planned) actions inferior, weakened or subject to being dominated or overthrown, or that renders your ability to do something obsolete.
Despite turning 18 and having new superpowers (the ability to go clubbing and drinking legally) my Kryptonic mother won't even let me leave the house at night to do such acts.
by LanksEO March 27, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

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