Top definition
v. Manually placing opaque paper, such as an envelope, over an abnoxious flashing advertising banner--so that it is easier to concentrate on signing into a social networking site (using a complicated password), or to concentrate on writing a gripping response to an intense incoming message, for instance.
"Gotta flash block that trailer or I'll never get in!"
by WorldofAshcraft May 16, 2007
Happy St. Patties Day!
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