British Columbia (a province of Canada)

(historical) the Chinese state of Jin (c. 11th century–376 BCE) during the Zhou dynasty / the 西晋 (Seishin, “Western Jin”, 266–316 CE) / the 東晋 (Tōshin, “Eastern Jin”, 317–420 CE)

outside of one's field of expertise

(dated, often self-deprecating) an old fart