noun
man who brings bad luck to women he's with
Vulgar, jocular slang. Refers to a man believed to cause misfortune to a woman he is near or has sex with. Often used in a teasing or self-deprecating way. Antonym: あげちん (man who brings good luck).
Antonyms: あげちん
彼氏がサゲチンで、付き合ってからずっとツイてない。
My boyfriend is a 'sagechin'—ever since we started dating, I've had nothing but bad luck.
「俺ってサゲチンかも」と彼は笑いながら言った。
"Maybe I'm a sagechin," he said with a laugh.
Compound of 下げ (sage, 'lowering') and ちん (chin, slang for penis). The exact origin is uncertain, but it likely emerged as vulgar internet slang.