while squared off with your opponent,shaking the right fist,as if ur gonna throw it,then in the magic second they make eye contact with it,you nail the lid shut with ur left!,that's a true sucker punch.

Easily confused with a punch defined as a "bitch move" a true sucker punch is quite a bit more complex than a simple unanounced attack.
It primarily involves a closed fist contacting the soft underbelly of a person (beneath the rib cage) at a high velocity, causing the ensuing force to press upward on the victim's diaphram, leading to a sudden expulsion of air from the victim's mouth and lungs. This opening blow leaves the victim open to various other attacks, often leading to what would be called "bitch moves" becuase of the defenseless nature of the victim.

This occurs when someone hits someone else from behind, usually when the person being hit doesn't know it until afterwards. Usually considered shady or a "bitch move".

When performing oral sex on a man, one punches him in the testicles just before orgasm. The surprise pain replaces any pleasant feelings received from the orgasm, or stops it altogether. Can be used as a punishment or as a sexual act.
If two gay males are involved, and it is being used as a punishment, the term then becomes 'Sucker punch, gay revenge'. However, it is performed in the same way as mentioned above.

What Floyd Mayweather did to Ortiz on September 17 2011..

A punch that takes your enemy by suprise, possibly knocking them out.

Comes from them being a sucker for not having their guard up

Term used to describe the type of melee a player in the video game Halo 3 performs when pressing the B button on the Xbox 360 console while holding a bomb in assault.