Being so incomprehensibly slutty and ditsy that a new word was devised to express the true nature and magnitude of one's sluttiness. Myth dictates that once lived a half-mortal who was so slutty that she made the geisha of Japanese emperors feel like the nuns of Avalon. This adjective therefore bears the name of this allegorical creature called Lucky.
Person 1: Did you hear, Angie made out with 6 guys last night.
Person 2: Yeah man, she was definitely slucky last night.