snap one's fingers at
snap one's fingers at {v. phr.}
To show contempt for; show no respect for; pay no attention to; scorn; disregard.
John snapped his fingers at the sign that said "Do not enter," and he went in the door.
The highway sign said "Speed limit, 35 miles per hour," but when a driver snapped his fingers at it by going 55 miles an hour, a motorcycle policeman arrested him.
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Source: A Dictionary of American Idioms