To move out of some place or thing in a bouncy or spasmodic manner. Jenna's annoyance was evident by how she flounced out.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
flounce out (of some place)
to bounce or bound out of some place. She turned up her nose and flounced out of the shop. She flounced out in anger.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.