OMAC 

Acronym for the phrase "Oh my aching Christ!"

When Sarah Palin started to talk, the audience let out a collective groan that sounded like "OMAC".

OMAC by lamewad October 4, 2010

Omac Cup

Making the middle cup in a 10 cup beer pong set up. Originated from a student in whitewater with a Nickname of Omac that more often than not made the middle cup.

Oh man I hit the omac cup that's some hellen keller shit

Omac Cup by whitewaterjones February 3, 2013

cos omac midaldil 

Your mothers vagina dangles like the sleeve of a wizard. (Egyptian term)

cos omac midaldil neeck

cos omac midaldil by Mastah Omz! March 6, 2009

Cos Omac 

An offensive word in the Arab world, which simplifies to "your mother's vagina". It also has different variations such as "Cos Omac Medaldel" which means "Your mother's Vagina dangles like the sleeve of a wizard". And it can be spelled in different ways such as "kos omak/cos omak/kos omac"
Cos - Vagina
Omac - Your mother

Dave I can't believe you ate my sandwitch, cos omac!

Michael cos omac I am trying to sleep.

Cos omac bro, your fart smells like shit.

Cos Omac by thewizewizard February 1, 2014

Pullin an omac 

Pullin an omac means to simply not give a fuck about another persons feelings.

When they aren’t ready for a relationship but also don’t want you to be with anyone else. Pullin an omac

Pullin an omac by Puckslut19 June 12, 2022

omacious 

· The Unknown
· The feeling of being or experiencing the unpredictable

I'm feeling very omacious right now...

omacious by The Night hound February 28, 2023

omachonu

Omachonu is an Igala name which means 'Child is king' it is usually given to Princes. People who bear this name are characterized by high intelligence, critical thinking and empathy.

My name is Omachonu!

omachonu by EarlJoey February 4, 2020