A short phrase you can use in everyday situations, standing for:
L - Lighting
M - My
F - Friend's
A - Ass
O - Onfire
A - At
O - Open
A - Aphrodisiac
O - Oranges
Archie - What did you do over the weekend?
Matt - Oh, I LMFAOAOAO!
Archie - wtf man
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.