(slang) to bluff or to fake one's abilities or intentions, usually in an attempt to intimidate someone
Definitions (粵典–words.hk)
動詞
同人真正開打之前，炫耀或者吹噓一下己方實力 to show off before a fight, or an argument, by using abusive language; to bluff someone off; to act tough
想拋我浪頭？慳返啖氣啦，阿叔嚇大嘅。
想抛我浪头？悭返啖气啦，阿叔吓大嘅。
soeng2 paau1 ngo5 long6 tau4? haan1 faan1 daam6 hei3 laa1, aa3 suk1 haak3 daai6 ge3. You want to bluff me off ? Save your effort son, as your uncle, I was well trained by threats from the youth.