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1.
Hereditary Fault.
(+ The product of a One Night Stand)

+ Some one who turns out to look nothing like either parents

+Someone who turns out to have any personallity traits of the father or mother
Sam: "Did you hear about jimmy's story? His mom and 'dad' had a one night stand"
Terry: "You mean jimmy's a Hereditary Fault?! Nasty..."
by Bob. August 21, 2004