(Internet slang, dated) Initialism of rolling on the floor, laughing; used to indicate great amusement at something in a discussion group, etc. / (rare, dated) Initialism of ran out for lunch.

(Internet slang) Initialism of rolling on the floor laughing my ass (or arse) off; used to indicate great amusement.

(Internet slang) Initialism of rolling on the floor laughing my fucking ass/arse off.

(Internet slang) Initialism of Rolling on the floor laughing out loud.

(Internet slang) That made me laugh.

(Internet slang) Used to indicate amusement.

(Internet slang, vulgar) Initialism of rolling on the floor laughing my motherfucking ass/arse off.

(Internet slang, vulgar) Initialism of roll on the floor laughing my motherfucking goddamned ass/arse off.

(Internet slang, vulgar) Initialism of rolling on the floor laughing my goddamned motherfucking ass/arse off.

(pharmacology) 2-bromo-1,1,2-trifluoroethyl methyl ether, a halocarbon drug investigated as an inhalational anesthetic but never marketed.