- probably imitative of the sound of a blow
1: a relatively abrupt convexity or protuberance on a surface: as a: a swelling of tissue b: a cranial protuberance
2 a: a sudden forceful blow, impact, or jolt b:
3: an act of thrusting the hips forward in an erotic manner
bump. (2008). In Merriam-Webster Online Dictionary.
Retrieved May 15, 2008, from http://www.merriam-webster.com/dictionary/bump