also: だめお · ダメおとこ · だめおとこ
noun
loser guy; no-good man
Colloquial, often derogatory term for a man who is unreliable, irresponsible, or a failure in life, especially in romantic contexts.
彼は仕事もせずにギャンブルばかりしているダメ男だ。
He's a no-good guy who just gambles without working.
あのダメ男と別れて正解だったよ。
You were right to break up with that loser.
Compound of ダメ (no good, useless) and 男 (man). The reading ダメお is a contraction of ダメおとこ.