Another angle: "Self-suck" might be a term from a video game or a niche community. If "Longmint" is a character, perhaps in a story or RPG, "selfsuck" is a mechanic or trait. But without knowing, I have to generalize. So the response should be speculative but cover possible angles. Also, check for typos. Maybe "selfsuck" is a misspelling of "self-suckle" or another term. But that seems unlikely.