not one to talk; look who's talking
Used to point out hypocrisy: the speaker is in no position to criticize others because they have the same fault. Often follows a statement about someone else's flaw.
See also: 人のことを言う (ひとのことをいう)
He's often late, but I'm not one to talk.
「またミスしたの？」「人のこと言えないでしょ。」
"You made another mistake?" "Look who's talking."
Standard kanji-kana mixed spelling.
Variant using 事 for こと.
Kana spelling for 言えない.
Variant with 事 and kana いえない.
From 人のことを言えない, literally 'cannot say about others', used idiomatically to mean one is in no position to criticize.