1) An
awkward drinking posture, manner and style; an attempt to avoid consuming an alcoholic beverage
2) Utilizing an awkward posture or style to avoid consuming alcohol, when you call someone out on doing a Bruce sip, you are calling them unmanly and unaccustomed to consuming strong beverages
3) Apathetic beverage ritual, the “Bruce sip”; consuming an alcoholic beverage by rotating
one's
head backwards simultaneously rotating the glass forward- keeping the top of the glass perpendicular to the floor