Egg counter
Someone who predicts the result of something before it happens. Comes from counting how many chicks will hatch under a hen before they have hatched.
Douchey nerd "If my calculations are correct i scored 98% in that test"
Teacher "Don't be an egg counter boy!"
next day
Douchey nerd "But that can't be! how'd I get 99%????"
Teacher "Well you should'nt be an egg counter"
Teacher "Don't be an egg counter boy!"
next day
Douchey nerd "But that can't be! how'd I get 99%????"
Teacher "Well you should'nt be an egg counter"