A) one who drinks coffee to the point of excess.
B) amateur connoisseur and/or coffee lover.
C) heavy coffee drinker of Canadian descent.

Origins: Derives from the root word Hoser; central and eastern Canada; northeastern United States. Originally a derogatory term to connote someone as a lush for beer in particular. Developed into a slang, jovial term for a Canadian person based on the stereotype that Canadians drink too much beer.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.