close friend, bosom buddy / crony, chum

Short for かも知れない (ka mo shirenai, “may, might, perhaps”).

岡本: a surname

鴨川: a city (市 (shi)) in Chiba Prefecture, Japan, on the southeast of the Bōsō Peninsula; the Kamo River in Kyōto Prefecture, Japan; traditionally, the Kamo River downstream from the point of confluence with the Takano River (高野川, Takanogawa)

鴨る: “to make a duck of someone”: to skillfully or cunningly beat out an opponent, such as in gambling or a swindle

貨物: freight

(chiefly women's speech) first person singular pronoun: I, me

a surname / any of various cities, towns, or districts in Japan, especially Kamo, Niigata.

a surname / any of various places in Japan

鴨: duck