"person a: *tells a funny story* person b: lmbo person a: wait, but you're a girl, you don't have balls
"laughing my butt off  "laughing my boobs off"  "laughing my balls off"  they're all implying the same thing
""person a: *tells a funny story* person b: lmbo person a: wait, but you're a girl, you don't have balls" What is the definition of "lmbo"?