Top Definition
A meaningless phrase, started by a retired Minecraft modder (The founder of the IndustrialCraft mod)
Mostly the word is used as a "filler" word to break silences, as a greeting or a goodbye.
"Hi John, how are you?"
-"I'm fine.. How are you?"
"I'm good.. HAYO!"
by Appels_NL December 17, 2014
1 more definition
Hayo is often times used by the compulsive beings of this earth to express sexual references. These beings commonly and most often bear the name "rachel". Also, a very annoying, subtle way of saying, "I'M AWFUL. YOU SHOULD NOT GET TO KNOW ME"
Me and Jimmy just had eye sex. HAYO
by nadiaaaaaaaaa June 30, 2010

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