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1.
A greeting typical in online games, message boards, instant messages, etc.

Can add as many hi's as you want to it for emphasis.
1) Random_Noob_01 has entered the game.
2) Random_Noob_01: hihihihi
by Asiafan July 28, 2003
176 86
 
2.
radio term

ha ha (laughter)

"hi hi" is the Morse equivalent of a laugh as in Morse it sounds like someone chuckling ("hehhehhehheh hehheh"). That is ditditditdit dit dit --- or dot dot dot dot dot dot. You really have to listen to it sent in Morse to appreciate its laugh like sound. It is most commonly used in CW (Morse Code), but has carried over to voice as well. Many CW expressions have carried over to voice -- such as 73 (Best Regards) and 88 (love and Kisses), etc. The origin probably dates back before radio to the telegraph days. And since Hams used Morse long before voice became practical-- the sound of the Morse characters HI HI was used to resemble a laugh sound. In some sense it is equivalent of a smiley. It's onomatopoeic -- that is the naming of a thing or action by a vocal imitation of the sound associated with it (as buzz, hiss) The definitive answer might be found in the "Dodge's The Telegraph Instructor Manual" circa 1850 to 1900. However, I have never been able to find a copy of this document. Wish I could as it would help to see the transitions from telegraph to radio usage.
hi hi om 73 de w2hht
by IrishRepublicanArmy January 01, 2004
29 6
 
3.
When a very bubbly or happy person is in a good mood and wants to greet you in a special way.
Sara has just gotten an "A" on her essay and she walks up to her friend, Jayne.

Sara:Hi-Hi!!

Jayne: Hey, Sara

And the two friends walk away with Sara blabbing away happily.

by Kristella May 07, 2008
5 1
 
4.
The sound made when you laugh.
You can also use haha, and hehe.
Works either way.. :P
Hihi.. thats funny..

or with irony..
(you seesome dude fall down and break his leg off): hihi.. fun-ay.. *not*
by Odda2k March 08, 2004
104 114
 
5.
Greeting used by pre-teen and teenage girls, (sometimes guys) in central Florida who are hyper almost all the time and, laugh at every little thing in the world; should always be typed with an exclamation point. This was started in Citrus County, FL in mid 2006.
*Girl 1 walks into room*
Girl 1 – Hihi!
Girl 2 – Hihi! What’s up?
by Jade McMorbid November 10, 2007
55 80