The phrase comes from Tokyo Ghoul, where Kaneki is forced to count backwards from 1000 by sevens to stay conscious during torture. Online, 1000 minus 7 became shorthand for a ghoul mindset, then spread through anime edits, phonk tracks and Russian speaking gaming culture. It became closely tied to ZXC, the one versus one Shadow Fiend duel format in Dota 2, where players pause, count and posture before fighting. That mix of anime pain, gaming ego and deadpan repetition keeps it in constant meme use.