under butt


n. the cleavage at the bottom of ur b-tt and top of ur leg. usually on girls with bigger b-tts. also known as under tuck.
guy 1: d-mn! do u see that chick over there? shes got a nice -ss!
guy 2: yeah shes got a nice under b-tt too!
the distinct area off the bottom that is at the lower part of the gluteus maximus. usually the underb-tt is highly regarded in terms of attractiveness. often the underb-tt is discovered at the beach when womens bikinis do not cover the whole area of the bottom.
amy has an excellent underb-tt
the second b-tt created below the original b-tt by tight underpants, where the elastic is doing all the work, under tight pants.
in my jogging tights i have an underb-tt and a m-ffintop and in between is my ba-donka-donk

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