The growth of fuzz, hair, or fur on the lower back entering to the domain of one's buttocks; usually pertaining to the male race, but also including rather masculine females
Much like an assumption but instead of making an ass out of you and me, the person simply makes an ass out of themselves.
Guy1: Do you like fishdicksin your mouth?
Guy2: Nah fishsticks are gross
Guy1: AHAHAHA what are you a gay fish?
Guy2: What are you talking about
Guy1: Wait did you say no? ....shit
Guy3: dude way to assurself