Top Definition
A term to describe a bet that is virtually guaranteed winner, but in reality it is just a coin flip.

The term is a modification of the term, lock, which is used to describe a guaranteed winner in sports betting.

The use of this term is introduced by a poster, Richkas, who use the term to gain attention for his sports gambling picks. Due to the fact that his mortal locks are no better than a coin flip, the term is usually used as a comical modifier for sports gambling picks.

There are several variations of the term lock. Some popular variations are, Sicilian Lock, bet your mother's house lock, and $$$mortal lock$$$.


St. Louis Cardinals is a mortal lock.

Bet the blues, it is a mortal lock.
by picoman March 31, 2009

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Something that cannot lose. 100% sure bet.
Michael Schumacher to win the WDC is a Mortal Lock!
by Riker! July 24, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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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