Verb. To emphatically agree to attend an event, only to not not attend, without any notification.
Are you going out with Sean or is he Haysing you again?
by larucifer July 7, 2010
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1. n. A form of "Hi," used predominantly on the internet.

2. Pn. A kid in my gym class.
"Jake?"
"Here."
"Hai?"
"Hello, how are you?"
by jakeftw! January 9, 2009
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that funky green plant all the kids are smoking nowadays
smokin' on haaaayyyy in the middle of the bar..... - crucial conflict
by King Nicky July 16, 2003
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The retarded way of saying "Hey" in conversation. Mostly used over the internet because the person is a complete dumbass and can't spell "Hey", or they're just being sarcastic and making fun of those dumbasses.
Dumb Person: HAY GUYS!
Normal Person: Shut the fuck up.
by AuntieTATA August 24, 2005
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Husein's gay way of saying hi
Husein: hai
Person1: hi *omg ur so gay*
by -PoLiTiCaLLy--iNcOrrEcT January 13, 2005
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