a sour jerker is when a man is turned down by a women and he is sent home alone. since he was planing on having sex and has no partner he wacks off but still mad about not getting sex. thus jacking off with a sour face.
When you jack off so hard that your face looks liek you just ate alot of sour candy.
rod: look there is fish
jose: yea he never gets any he is such a sour jerker
rod: yea i know he is such a sour jerker