3 definitions by Vernon Mills

The act of a dog (or dogs) putting its head outside of a moving car's window, often resulting in funny ear streaming, teeth baring and jowl flapping (or muttflap) from the impact of wind.
Look! A bulldog muttfluttering in that Ford Fiesta
Rex loves to muttflutter. He looks so funny when he starts to muttflap
by Vernon Mills January 9, 2017
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The result of muttfluttering - what happens to a dog's ears, mouth, hair or jowls when poked outside of a moving vehicle and exposed to excessive wind
Look at the muttflap on that hound!
The muttflap on Rex is crazy... that's why the side of my Ford Mustang is always covered in drool!
by Vernon Mills January 9, 2017
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