Lewis Short
cottăbus (noun M) : κότταβος (a social sport consisting in dashing a liquid upon a brazen vessel; v. Lidd. and Scott under κότταβος; hence humorously transf.)
* A clap, stroke: ne bubuli in te cottabi crebri crepent,Plaut. Trin. 4, 3, 4.
Charlton T. Lewis, Charles Short, A Latin Dictionary