oh-emm-gee 

it's a shortened word that stands for "Oh My God" and it starting to become a phrase actually used in REAL-life human interaction when having a conversation. It's sad seeing grown ass people using that phrase when talking to others....

Me: can i borrow your shoes?
Sister: no, i need them

*sneaks in and takes the shoes from closet*

Sister: What?!! take my shoes off!, Oh-emm-gee!"

oh-emm-gee by Makeup Addict August 13, 2009

oh emm eff gee 

A long version of OMFG. This longer version is usually used to express an "over the topness" about things. Used in one of two ways. Either sarcastic in nature, or absolutely shocked and amazed. Sometimes this is used when someone says something which - in their mind - is awesome or shocking, but to the respondant, is quite the opposite. On the flip side, sometimes this is just "HOLY SHIT!!!!" type levels of shock and amazement. Either works.

Person A: "I walked my dog today!"
Person B: "OH EMM EFF GEE!"

or

MMORPGDUDE: "We took down UberBossFace!"
MMORPGHOMEY: "OH EMM EFF GEE!!!!!!!!!"

oh emm eff gee by Mr. Capo June 22, 2006