Top definition
An adaptation of OMG (oh my god) used when talking about threesomes.
Some people got all riled up over an upcoming episode of Gossip Girl in which three of the show's characters engage in an OM3.
by dwigtdwigt November 04, 2009
Mug icon

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