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
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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