There are various synonyms for the word "haddest goose bumps," all of which represent the feeling of hairs standing up on the skin's surface. Some examples of synonyms include the words "horripilation," "piloerection," and "gooseflesh." "Horripilation" is a medical term that describes the involuntary contraction of the tiny muscles attached to hair follicles. "Piloerection" is another medical term that refers to the same phenomenon. The term "gooseflesh" is a more colloquial term used to describe the skin's response to cold temperature or strong emotions. Other synonyms for this sensation include "thrill," "shiver," and "chills." Regardless of the word used, having goose bumps can be a response to a myriad of stimuli and is a natural physiological reaction.