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When you intentionally or unintentionally stop a bro from hooking up with an ugly chick. It's a positive form of a cock block.
(Person 1) "Bro you hooked up with an ugly girl last night."

(Person 2) "WTF Dude, why didn't you Bro Save me, I was drunk and helpless?"
by brosave123 September 27, 2010