Top Definition
When a bro does something for another bro that's almost literally too bro to be true.
Guy: "Hey man, I know my leg is broken, and it's hard to walk, but I figured you'd dig a drink, so I hiked the half mile up this cliff with this large ice chest full of freezing cold water, Big Red, and Natty Lite."

Other guy: "Dude, that is fucking impossibro."

They then proceed to Impossibrofist as fuck.
by Wright_Thoughts July 06, 2012
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