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"
by Chugmeister of Sicily June 22, 2010
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