A bubble butt, as referencing one's buttocks.
Bubble Butt is referring to the shape of a person's buttocks. It is NOT implying a 'fat' buttocks, but rather a more round shape that the two butt cheeks create. It is considered to be slightly larger than the average 'pear shape' buttocks.
Primarily used in heterosexual relations, or sex. More aptly referring to females, rather than the male buttocks.
Used to define the shape and/or appearance of a buttocks, generally used in Erotic Literature or Conversations with sexual overtones. Mainly used to provide a more 'apt' description of a sexual 'turn on' or in some cases, 'turn off'.
Practice (Associated Acts): Trait sought after by many who worship the buttocks.