munch out (on something)
To eat (a specific thing) gluttonously or to excess. Once a month, my friends and I get together and munch out on pizza and watch cheesy horror movies. I'll just have a salad. I've been munching out too much lately.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Sl. to overeat. I can't help it. Whenever I see french fries, I just have to munch out. I try not to munch out more than once a week.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
in. to eat ravenously. (see also pig out.) I had to munch out after the party. I can’t imagine why.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.