1. superlative form of flappy; most inclined to flap or move loosely and noisily
Usage: informal; comparative form is 'flappier'

Examples

• The flappiest part of the tent was the loose corner that kept hitting the pole.
• On the windiest day, the flappiest flags in town were those at the harbor.
• Her flappiest jacket sleeves would wave around whenever she moved her arms.
• The flappiest pages of the old book were at the edges where the binding had worn.
• That's the flappiest sail I've ever seen on a boat.