While balls deep in a vagina from behind whilst wearing a skeleton costume and a pink sock starts sneaking its way out, quietly peel off an arm bone and jam it in her anus while you continue merrily on your way to ejaculation.
Word used by the character Olaf (Silent Bob's Russian cousin) in Clerks, supposed to be Russian, but really just a made-up word by Kevin Smith who was trying to think of a word that sounded Russian. Also spelled "skrelnik" at times.
Jay: Olaf, girl nice?
Olaf (looks Jay's Lady Friend over): Skrelnick!
Jay: That's fucked up, man.
Jay's Lady Friend: What did he say?
Jay: I don't know, man, but this guy's a character.