XSWL is Chinese slang meaning basically the same thing as LMAO.
It's comprised of the characters 笑(xiào)死(sǐ)我(wǒ)了(le
A texting conversation

Person1: Ever since he feel into the bin last year everyone's been calling him bin boy.

Person2: xswl

Person2: So funny
by DoorHandle1234 August 22, 2017
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