A slang term used in response towards an issuer of verbal threats and/or an aggressive posture, to indicate that the receiver of the threats is ready, willing and able to engage in physical combat, in an act of self-defense should the issuer of the threats wish to escalate the situation to a physical one. This slang term is normally used by people who are extremely confident in their ability to easily neutralize/subdue the aggressor. eg. Walk the walk, don't just talk the talk.
Hothead: Hey homeboy, yo mamma was gud' in bed last nite, haha!
Icecold: Come at me...
*Icecold knocks Hothead the fuck out with 1 punch to the jaw*