Future etymologists will conjecture that it has something to do with the popularization of an obscure lichen meme combined with a contraction of the word “submissive” within the BDSM context, and only started being used as an ironic punctuation to statements after another popular meme, similar to the origin of how “F” is used as a common, brief response to a tragedy.

My son, always remember to smash that like button and subscribe…*sniff* and please, whatever you do, leave a review because it helps new people find the channel. Oh god, I’m no good at goodbyes…