LMBO
Laughing my butt off
Example
I am lmbo after watching that video!
LMBO definition by Slang.net
This page explains what the acronym "LMBO" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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LMBO is an acronym that stands for "laughing my butt off," and is a less offensive version of LMAO. The acronym typically appears in texts and online to react to something that is especially funny.
People like to exaggerate their reactions to make things sound cooler or bigger than they actually are. LMBO is just one example, along with FOTCL, ROFL, and LHO.