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1.
Sex Kick is the fan name of the neutral air kick for many characters in the popular game Super Smash Bros. Melee.

It comes out hard, gets soft, and totally fucks everyone.

Dr. Mario has the Viagra Kick, because unlike all the other characters Sex Kick, his comes out soft, and then gets hard.
Ping: I hate getting hit out of my combos and killed by Luigi's Sex Kick, it's a get out of jail free card.

PimpUigi: Hey, Luigi can't win without having Sex.
by PimpUigi September 10, 2011
 
2.
A person who often is involved in threesomes accompanied by a superior lover; a sexual sidekick
Oh, his friend was amazing, but he was more of a sexkick
by Chinabekastanian August 04, 2010
 
3.
A teenage girl reaches the age in which she wants to get fucked for like 4 hours straight by a cock 6" or greater.
"Damn Julia, I think I'm in my sex kick, when I see guys I just want to get uber-rammed."
by lionhardt August 16, 2008