The Latin equivalent of "lol" (laugh out loud). Lolus Auditus was a common expression of ancient Romans in the forum. Many of the people who hung around the /b/ (/roman baths/) area of the forum especially enjoyed the use of this phrase.
Septimius: "Tuum mater scortum magnum est."
Gaius: "Infercio meum phallum longum de inguli tui sororis."
Claudius: "LOLUS AUDITUS!"