O Ring

a round seal, often made of neoprene or some other compressible "rubber-like" compound, that is an industrial part.Looks like the part of a condom that unrolls before you actually unroll it. Can be used as a cock ringif you get the right size

"My buddy's a mechanic, I went thru his box of assorted O rings and found the size I can use as a cock ring. Nancii's gonna beg for mercy tonite !"

O Ring by Jake March 6, 2004

O-Town 

Nickname for many cities beginning with the letter 'O'. Anyone living near such a city believes their city is the only true O-Town.

Ottawa, Canada is known as O-Town.

O-Town by Mister Marbles September 25, 2010

O_O_O_O

Means something that is much more surprising than a simple wide eyes.

also counting: o.o.o.o

Example 1:
random person #1: Dood, I got like $500,000
random person #2: O_O_O_O_O_O

Example 2:
person #1: I'm pregnant with your man's baby.
person #2: O_O_O_O_O_O_O_O_O_O what?!?!

Example 3:
person 1: Hey what's up?
person 2: Nuffin much, you?
person 1: Oh nothing really 'cept I got beamed up to an alien ship and was probed multiple times, other than that, nothing really.
person 2: ...o.o.o.o.o.o

O_O_O_O by animechick3344 August 19, 2007

o rlyz 

just like saying "o rly" (oh, really) but in a slightly different more cool way. essentially a more emphatic "o rly"

Tbone: I'm tired
Bpat: take a nap
Tbone: o rlyz?

o rlyz by Toe Moss January 7, 2009

(o)mogi

(adj/n/v/adv/pron/prep) of,or pertaining to everything and anything good or bad or ugly or cool or alex wong.
p.s. The first 'O' is optional.

1. MoMo is frigging omogi!(adj)
2. She is just a nasty mogi!(n)
3. I omogi you.(v)

(o)mogi by I AM SO OMOGI October 12, 2004

O.N.S. 

One night stand

Anyone down for a O.N.S.

O.N.S. by Rashad843 January 20, 2017

o'kane train 

When a girl is sucking your cock and you desire to get pussy, you say "Ready to ride the O'Kane Train?" And then you fuck the bitch until she moans.

You ready to ride the O'Kane train.

o'kane train by bleeding gums merphy April 22, 2005