Top Definition
Sperm that rarely joins up with an egg to fertlize it.
Jerry has lazy swimmers so I can't get preg
by smehmet1 January 19, 2005

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Another term for low sperm count.

Basically saying when a male doesn't have a high sperm count, or when the sperm dies before reaching the egg, it's nearly impossible to father a child with a female. There have been cases when a male with a low sperm count can actually father a child, but for many others, it's impossible unless their female counterpart is highly fertile or when one of the sperm actually does make it to the egg.
by Elektra_Stone November 10, 2010

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