to say obscene or vulgar words
English Wiktionary, “烏嚕白嚕” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%83%8F%E5%9A%95%E7%99%BD%E5%9A%95 · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)