ROTFL Views 6 meanings found ROTFL is an internet slang expression meaning someone is laughing uncontrollably, though the same letters occasionally appear in technical contexts such as test frequency measurements. Miscellaneous Roll Over The Floor Laughing Roll On The Floor Laughing International Rasch Obige Teilerkenntnis Frenetisch Lobend Academic & Science Range Over Test Frequency Level Regular Old Text Formatting Language Internet Rolling On The Floor Laughing