flaff I. \ˈflaf\verb (-ed/-ing/-s) Etymology:flaff from Middle English (Scots) flaffen, of imitative origin; flaffer freq. of flaff intransitive verb orflaf·fer\-afər\chiefly Scotland: flap, flutter < flaff in the wind > transitive verb chiefly Scotland: to cause to flutter or flap < the bird flaffs his wings > II. noun (-s) 1.chiefly Scotland: a movement made by flapping or fluttering 2.chiefly Scotland: a burst or gust especially of wind