Top Definition
A tactic by which a person stays dry during a rainy period by taking advantage of an above average height stranger holding umbrellas by walking underneath them.

A person may commonly use this in densely populated areas, in order to stay dry if they have not planned ahead for poor weather.
John: "Hey Peter, where's your umbrella? It's pouring outside and you're completely dry"
Peter: "Who needs an umbrella? I just underbrella-ed over here"
by Aidoni. T July 06, 2014
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