A word used to describe someone who attempts to slide into the dm's of someone either out of their league or someone who would be completely uninterested in them.
Billy: Hey dude! I just found this really hot girl on Instagram do you think I should try slide in her dm's?
Jeremy: DUDE ARE YOU SUISLIDAL!!! That's Jessica she's like a 12/10 and you're a disappointment.
Billy: You're right, I don't want to commit suislide...