a serviceman in the artillery
"The veteran gunner adjusted his rangefinder to ensure the next shell would hit its target accurately."
someone connected with Arsenal Football Club, as a fan, player, coach etc.
"At our office happy hour, Sarah is on duty as gunner since she's already poured everyone's first round of beers."
Artillery soldier, or such who holds private rank. Abbreviated Gnr.
The person designated to pour drinks in a drinking session.
A surname.
"The local football team's star striker, Gunner, scored a hat-trick in last night's match."
Alternative spelling of gonna
"Wait, did you just say gunner instead of gonna?"