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1.
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.
John sucker punched David, and then he nutted him while he lay gasping for breath.
by Visa July 20, 2005
 
2.
A punch that takes someone by surprise, a punch coming from out of the blue.
When John turned around, Mike floored him with a suckerpunch.
by wetwebwork March 04, 2006
 
3.
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".
That motherfucker came up and sucker punched me!
by Mason April 14, 2003
 
4.
When someone punches you and you didn't evan know you were fighting
"Hey, whats that over there?"
"Where? OW!" Suckerpunch.
 
5.
What Floyd Mayweather did to Ortiz on September 17 2011..
Oh your trying to apologize to me? Ok...Now I'm going to sucker punch you because I am probably going to lose.
by Hawkspurm September 18, 2011
 
6.
A punch that takes your enemy by suprise, possibly knocking them out.

Comes from them being a sucker for not having their guard up
The standoff broke when i saw this guy zoning out and threw the sucker punch
by Da Suka punch March 25, 2004
 
7.
When a lady friend is sucking your dong and punching your balls simultaneously.
"Hi Billy, how was your night last night?"

"Hi CJ. It went swimmingly! I met up with Mona and she suckerpunched me for, like, an hour. My scrot really hurts today. And my wang is all dried up"
by BillyBonez August 22, 2008