A type of plant that is the leader of the local plant gang. Is usually a cactus or some other poky plant. Acts as a "representative" for their gang in all of the rumbles. You don't want to mess with them.
The phenomenon wherein a cute boy wears a plaid shirt, and suddenly becomes 100% more attractive to all heterosexual females and homosexual males in the vicinity.
Jane: Whoa, did John get hotter?
Joseph: Nah, he's just following the plaid shirt rule.