Sex-kick

From Smash Bros - Wiki on Neoseeker

A sex-kick is a term used to distinguish any of a variety of kicks that continues to damage when the animation has stop. In general, sex-kicks get weaker the longer the attack has been out, although some characters, such as Dr. Mario, feature the opposite. These attacks are normally found as the characters Nair, though some characters display sex-kick properties on several attacks. In Brawl especially, characters have certain moves which exhibit the properties of a sex-kick without necessarily being a genuine kick.