Super wild instrument. I really have no clue of its origin or use. Its hand carved all the way around in a pretty sophisticated style. Has a tramp art vibe for sure. Wood seems to be in the walnut family which could place it in Asia. There's a hairline crack in the middle of the club so you probably shouldn't be hitting anyone with it. 20 inches in length and about 4 inches at its widest. 

Hand Carved Ceremonial Club Folk Art