LMAO /ɛlˌɛmˌeɪˈoʊ/verb 1exclamation 1forms 3 verb1 •(Internet, vulgar) To laugh one's ass off.Reading this website will have you ROFLing, LMAOing, and LOLing every time you read it. — 2009 exclamation1 •(Internet, vulgar) Initialism of laughing my ass/arse off; used to indicate great amusement, usually exaggerated.“LMAO. Cook him,” one said. “Grass needs to be touched,” another added. — 2024 formsLMAOed · LMAOing · LMAOs