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1.
Genetically disfigured spermatozoa which can potentially bore mentally and/or physically impaired offspring once mated with an unfertilized egg. Common among male inbred species (see: hicks) and those who undertake long periods of celibacy without masturbation. The chances of producing tardpoles can be minimized by strict adherence to ALL of the following:

1. Prevention of any injury to the gonads.
2. Avoidance of mating with one's sister, cousin, and/or other close relative.
3. Frequent stimulation of the penis until after ejaculation has been achieved.
"Dude, Ortiz just got beaned in the sack by a 95 mph fastball...He'll be shooting tardpoles from now on."
by MJDP May 04, 2008