拋書包 (paau1 syu1 baau1) — to show off knowledge in Cantonese
paauˉ¹拋syuˉ¹書baauˉ¹包简 抛书包
Mandarin Pinyin: pao1 shu1 bao1
Meaning of 拋書包
nounto show off knowledge
nounliterally: throw the schoolbag, which means a person is pedantic or try to showoff with one's knowledge