Dated, derogatory, or familiar pronoun for a third person. Often used with contempt or rough familiarity, similar to 'that fellow' or 'that guy' in older or stylized speech.
I have no idea what that guy is thinking.
Don't mind what he says.
they; those guys
they; those guys; those fellows
Usually written in kana; the kanji form 彼奴 is rare and may be confused with other readings.
Rare kanji form; can also be read あいつ or やつ, so context is needed.
A contraction of older かやつ “that fellow,” itself formed from か “that” and やつ “fellow.”