To attack someone out of hiser view.
Catherine put up a decoy and then blindsighted the group with a very big lawsuit.
by Luddz June 16, 2015
1 more definition
When Maher doesn't know what he's talking about. Told you that you didn't know what it means, Hayden ;D
Woah look at that blindsight
by OOLLOL December 08, 2010