Green’s Dictionary of Slang

(US) a gambler.

1858		in Dwyer & Lingenfelter Songs of Gold Rush 59: There was a noted gam-ba-lier a living in our camp [HDAS].
1866		Night Side of N.Y 76: The gay gamboliers would sometimes set four and twenty hours at a stretch.
a.1880		‘The Son of a Gambolier’ 🎵 I’m a rambling rake of poverty / And the son of a gambolier.
1905		D. Belasco Golden West 319: See here, gamboleer Sid, you’re too lucky [HDAS].