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1.
n.
Hai2u.com is an internet shock site. it features an photo of a woman vomiting while performing fellatio on man sitting in a lawn chair

The site has the text "HAI2U!!!1 :)" at the top of the page.

v.
To expose someone to hai2u.com without them knowing about the site to shock them.
"omg! this dude just HAI2U'ed me! IT WAS SOOOO GROSS!"
af Dan Lev 5. juni 2005
 
2.
Commonly used on IRC, represents the greeting "hi to you". Words are usually jumbled to save typing time, "hai 2 u", hai being a geeklike form of hi, 2 being short for to and u being short for you.
* female join the channel
<boy> hai2u
af OMG 9. maj 2004
 
3.
A Greeting, sometimes used to show everyone you're here.

Offshoots include Hai and Hai2uomg
1: Hai2u dood, leik wuts up.
2: Hai dood.
3: HAI2UOMG ANYONE HERE>?!?!/1/1
af Rockstar Rox0rs 20. november 2004