LMFBO
Laughing my fat butt off
Example
That's hilarious... lmfbo right now
LMFBO definition by Slang.net
This page explains what the acronym "LMFBO" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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LMFBO is an acronym that stands for "laughing my fat butt off," which is a more specific version of LMBO. It is a pretty obscure acronym that not many people know but if you think it's funny, go for it.
The acronym is typically only used by people with good sized rears. If you use it and you don't have a rather large bottom, then it comes across as weird or fishing for sympathy.