OHSHIT moment 

An OHSHIT moment is the instant between the pain and screaming, or the first time you smell Paris Hilton's cooch. (Maybe a mix of both.) Any sort of moment where you are bound to freak out has an OHSHIT, big or small. Here you may yell out a shitplitive, begin to cry, or crap yourself. Or all three.

(An example of an OHSHIT moment)

In Johnny's head-

'OHSHIT, definitely not having kids now.'

OHSHIT moment by Frank Rider August 22, 2009

OHsome 

Only when something is truly awesome, is this word allowed

That J was OHsome!

OHsome by blehhhhhh March 19, 2009

ohshitshespregnantitis 

the reaction you get when you find out you wife girlfriend or a random one night stand tells you shes pregnant.

jon: dude whats wrong with you
luke: you remember that girl i slept with about a month ago?
jon: yeah what about her?
luke: she told me shes pregnant
jon: ha thats funny ill be you have ohshitshespregnantitis right?

ohshitshespregnantitis by fl321chris November 29, 2011

Ohshway 

To not give a fuck

Greg:You're a faggot!
Zoë: Ohshway

Thus Zoë did not give a fuck

Ohshway by megamansex February 9, 2012

OHSC 

Abbreviation for Original Hard Shell Case. Often used in musical instrument, especially guitar, sales to denote that the instrument includes an hard-shell protective case which was originally issued with the instrument by the manufacturer.

eBay: 2011 Gibson Les Paul Custom w/OHSC and case candy

OHSC by Biffy Clyro December 13, 2012

ohsome 

like awesome; uses the exclamation "oh!" and the word "awesome" in combination in order to communicate that whatever the person is talking about is shockingly awesome and encourages a witness of whatever the person is talking about to say "oh!"

Harry is soooooo ohsome! Did you know he can tie his shoe with one hand, play guitar hero with his feet, AND eat 50 tacos in under a minute???

ohsome by huhwhat?56 January 20, 2009

Ohshitno 

An exclamation often used when something bad is about to happen, and is often said so incredibly fast that it almost doesn't sound like a word.

person 1: (about to spill staining substance on carpeted surface)
person 2: Ohshitno don't!

Ohshitno by Jibbity Jub-Jub April 8, 2015