Acronym of Oh my... which is short for Oh my God (omg). The person using "om" or "oh my.." plays with the ambiguity of not mentioning what she refers to: it could be God as it could be any other thing. It's wise to use this expression if you are nor a religious person.
Person A: this cam girl just squirted all over the sofa.
Person B: om...
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug