parting shot; sharp parting remark; parting threat
A cutting remark or threat thrown at someone as one leaves, often in arguments or dramatic exits. Common in fiction and everyday quarrels.
He left with a parting shot: "Don't ever come back."
After the argument, she flung a sharp remark and stormed out of the room.
Standard kanji spelling.
Mixed kanji-katakana spelling, common in manga and casual writing.
Compound of 捨てる (to throw away) and 台詞 (lines, speech). Literally 'throw-away lines', referring to words cast at someone as one departs.