bump·e·ty I. adverb orbump·i·ty\ˈbəmpəd.ē, -pətē, -i\; orbumpety-bumporbumpity-bump\| ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷\ Etymology:bumpety & bumpity irregular from bump (I); bumpety-bump & bumpity-bump reduplication of bump (I) : in a bumping, thudding, or jolting way < he felt his heart go bumpety > II. adjective orbumpity\“\ Etymology: irregular from bumpy : jolting, bumpy < a bumpety ride in a wagon over rough roads >