LMFBO has various meanings in the Internet Slang category. Discover the full forms, definitions, and usage contexts of LMFBO in Internet Slang.
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.
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