What is O!?
1.
An unexpected
Sheila had an O! when she awoke to Kevin sucking her nipple.
"I just had an O! when I changed my thong!" Lisa said.
See
2.
An attempt by the Omaha, Nebraska city betterment committee to create a slogan for the city. Unfortunately in their attempts, they didn't realize the sexual connotations that are now associated with it.
slogan-"Buy the Big 'O!'" Originally coined to keep commerce in Omaha businesses. Now means to go downtown and get a prostitute, or in some other way purchase a means of orgasm.
See
3.
This is the replacement for the word LOL which is a very overused word on the internet O! is a more useful word cause that is what you are rely doing when you say LOL
O! that was a funny joke