Top definition
a greeting on aim.
specially with anooying 12 year olds, who think there so cool while listening to hellogoodbye.
xxcutie: hey der.
toocoolforschool: heyy gurl
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2
Heyder means he there in slang language
Person 1: heyder
Person 2: hi, omg you are so cool dude!
by yoyozefun April 12, 2020
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