橫插一槓子 [横－－杠－]

Jyutping waang4 caap3 jat1 gung3 zi2
Pinyin héng chā yī gàng zǐ

Definitions (Wiktionary)
  1. phrase, idiomatic
    to interfere; to interrupt; to cut in; to have a hand in at a wrong time
    (syn.) 多管闲事, 插一槓子, 管闲事, 插一杠子, 多管閒事, 管閒事