cream puff I. noun 1.: a round shell of light pastry filled with whipped cream or a cream filling 2.slang a.: a timid, weak, ineffectual, or oversensitive person < no namby-pamby, cream puff fighter — Sporting Life > b.: something trifling or inconsiderable < the play is a diverting cream puff > II. noun : a usually used vehicle (as an automobile) that is in especially good condition