契kai3弟dai6

English

1. (n.) a godbrother; a younger man who is as close as your biological brother; an idiot; an asshole; a bastard; a gigolo; a term to address the younger male of a gay couple
2. a younger boy or man treated as a nominal younger brother; this usage is very uncommon and often replaced by the euphemism 契細佬 kai3 sai3 lou2, as the offensive usage (below) is often presumed when one mentions "契弟" ----
3. originally referred to gay males, and subsequently extended to mean a person with low social standing; in contemporary use, it is a generic vulgar term to refer to men; a jerk; a dick

粵語 — Cantonese

1. 經儀式（上契）確立名義關係，並冇血緣嘅細佬；但係「契弟」通常用嚟表達第二個釋義，為咗避忌一般人會講契細佬
2. 以前指男同性戀者，後來引申為社會地位低下嘅男人；而家已經變成一個冇乜特別意思，純粹鬧人用嘅字眼；專指男性（量詞：個/條）

Examples

• 你唔好恰我，咪當我契弟！

  Stop it. Don't you dare look down on me.

• 你條契弟今次仆街喇，我唔溶咗你唔得！

  You are done this time jerk. I am going to put an end to your life.