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.