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Someone who is stupid or says something stupid or someone who deserves to be jerk fingered.
Gerard: Can you eats Lions
Tim: You fucking Jerk Finger

And when you call someone a jerk finger, you jerk off your left index finger then point at the person in question with the right index finger and call them a "Jerk Finger". I'ts all in the fingers.
by croftbrudercandycane June 01, 2006
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2
The cramp someone gets in their index finger from Jerking off too much.
Jack: (Jerkin off) -AH! Jerk Finger!!!
via giphy
by norTnoJ September 15, 2016
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