(英文) 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) 你唔好恰我，咪當我契弟！ (nei5 m4 hou2 hap1 ngo5, mai5 dong3 ngo5 kai3 dai6!)
(英) Stop it. Don't you dare look down on me.
(粵) 你條契弟今次仆街喇，我唔溶咗你唔得！ (nei5 tiu4 kai3 dai6 gam1 ci3 puk1 gaai1 laa3, ngo5 m4 jung4 zo2 nei5 m4 dak1!)
(英) You are done this time jerk. I am going to put an end to your life.