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Falling down the stairs laughing.
A more hipper, cooler texting acronym than, let's say, rotfl or lmao.
Also used to describe more laugh worthy situations.
Fdtsl! Did u see wht Tommy did today at school?? Dude, he fxn made this chick cryyyy!xDD
FDTSL by killakyraskeetskeet June 15, 2010
Related Words
Person 1: June is Pride month.

Person 2: Yeah, those FDT's have really fucked up that month.
FDT's by Sillil October 7, 2021