noun
complaint; objection; finding fault
Colloquial noun for a complaint, often implying a petty or unreasonable objection. Frequently used in the phrase いちゃもんをつける (to pick a fight or find fault).
彼はいつもささいなことにいちゃもんをつける。
He always finds fault with trivial things.
そんなことでいちゃもんをつけられても困る。
I don't know what to do when you pick on me for something like that.
The origin is uncertain. It may be related to the dialectal word いちゃ (quarrel) combined with 物 (もの), but the exact derivation is unclear.