When it hurts to get an erection after to much sex or mastirbation.
After John fucked Sally 12 times in one night he had a severe case of throb knob.
by TheLeftRock August 17, 2016
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"My wife loves my throbbing knob!...but she hates it when I call it that."
by Nemo_R_A November 28, 2004
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