Top definition
When you and a bro high five in your minds because a. You're too far away from each other to actually high five b. You both just can't be bothered to high five or c. Because the action/event was so awesome that a normal high five just wouldn't suffice
Alex: Woah dude that was so cool, mental five

Harry: Nice!
by bluedudeinahole September 25, 2014
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