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11.
hay
A variation of the word "hey." Can be used as a greeting, usually with the syllable drawn out while simultaneously rising and falling in inflection, as illustrated below in Example 1.

Can also be used as an expression of enthusiastic agreement in a conversation, as demonstrated below in Example 2.

NOTE:
One theory suggests that this variation of "hey" was popularized by the character of Dwayne (portrayed by Haywood Nelson) in the sitcom "What's Happenin'," although Dwayne's usage was three "hays" with shortened syllables, with the inflection on the middle "hay," as shown in Example 3 below.
Example 1:

"HaAAAAAay!"

Example 2:

Person #1: "It sure is hot today!"
Person #2: "HaAAAAAay!"

Example 3:

"Hay HAY hay!"
by Joey Baggadonuts July 21, 2006
 
1.
Hay
A basterdization of the greeting, "Hey". Commonly used by /b/tards on 4chan.
"Hay guyz, what's going on!?"
by Irne May 09, 2005
 
2.
Hay
Marijuana that is old or has a lot of shake, or just some bap ass weed. At least thats how we say in Florida.
"Yo dont by trees from that nigga DaJuan, that nigga be servin that hay dog straight up."
by WeedMan March 08, 2004
 
3.
hay
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
 
4.
hay
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 23, 2005
 
5.
Hay
A term used to describe someone who doesn't follow through with plans, or bails on them.
"I was supposed to hang out with Willie today but he bailed again. What do you expect, he's hay."
by Donny Planet January 12, 2010
 
6.
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 06, 2010
 
7.
hay

1. hello(from a misspelling of hey)

2. marijuana

3. a bed
Hay dude! How have you been this week?
by The Return of Light Joker February 17, 2008