Top Definition
When you meet a friend in the street and you're both in a hurry to go places...

A quick hello or alrite as you pass each other... or frantic conversation..
All right, how are you?

Not bad, not bad!

Must go see you around i'm sure!

-end of conversation

now thats a hi-by
by fishpish September 06, 2007
when someone walks by you and says hi, without stopping to chat
Moesha did her usual morning hi-by to me, while I was chillin' in my cubicle!
by Sammy G63 November 17, 2008
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