Short for "The Heat Is On," which is the name of a song by Glenn
Most likely derived from the name of a short movie-type skit from Saturday Night Live, starring Ben Stiller, Jimmy Fallon, Horatio Sanz, and Will Ferrell as Glenn Frey. If you have not seen this skit, I highly recommend it -- it is absolutely hilarious!
by goobershanker April 7, 2004
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"the heat is on" - When someone is totally feeling your mack
Check out Ryan by the bar. The H is O!
by sageholden October 9, 2003
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When you hear this...you better look out! Someone is bringing the heat, maybe even glen frye.
'come in here with that kinda attitude, and the H is O!'
by HM December 17, 2003
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A chant that occurs in Columbus, Ohio between 2 individuals or 2 groups of people who are too stupid to get that not everyone they see gives a rat's ass about sports and can't spell the name of the four letter state they live in without help from other idiots. Proof that OSU students don't learn anything but how to get arrested, drink, fight, watch football and date rape each other. Anyone who yells "O-H" at you in Columbus is a complete waste of flesh and deserves to get their ass kicked.
O-h-i-o? It's a sad state of affairs when spelling the word Ohio is a group effort for homophobic jerks (who attend an institute for higher learning) that spend all their free time watching something as homoerotic as football.
by j-rocka1337 June 21, 2010
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h/o is an abbreviated way of saying "hang on."
Can I read you my story really quick?

Sure, but h/o a sec
by Gyrapage May 4, 2005
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Honest Opinion. Often used on sites such as ask.fm to ask for a person's opinion of someone
Question: "H/O on Sera"
Answer: "She's a bitch"
by ravix84 January 24, 2015
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