Learning #Chinese in #Doulingo, found a comment in the forum that wrote 了猫 (pronounced "le māo") as it sounds like LMAO in English.

了 is a particle used with verbs to denote a completed action
猫 is just #Cat

I never laughed that hard at a comment in a Doulingo discussion board. #了猫

Is this actually used or is just people fooling around?