It is a misspelling of "LMAO" that is most commonly used by people who think that they can type quickly but can't.
Guy 1: wanna hear a joke?
Guy 2: sure
Guy 1: so 2 guys are walking down the road
Guy 2: LMOA!!!
Guy 1: bruh are you even listening
Guy 2: sure
Guy 1: so 2 guys are walking down the road
Guy 2: LMOA!!!
Guy 1: bruh are you even listening
by KalbHimar October 26, 2020