club·by \-bē, -bi\adjective (-er/-est) Etymology:club (I) + -y : characteristic of a club or club members: as a.: displaying or offering informality, cordiality, or friendliness especially to other members of the same set or social group : sociable < we got rather clubby — Raymond Chandler > b.: open only to qualified or approved persons : select < the legitimate theater … is an uncommonly clubby field of enterprise — E.J.Kahn >