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1.
A wingbro is a person that goes above and beyond the call of duty that a general wingman would be responsible for. A wingbro will stand by you regardless of how stupid, insane, or dangerous the situation you created for yourself is, and will either help get out of the situation or go down with you.
A wingman will stand by you in a situation that he benefits from in some way, but only a wingBRO will show up 5 hours early to be sure you are intoxicated enough to not care about the outcome of the situation, regardless of how he benefits.
by Marco.Polo July 22, 2009
 
2.
like a wingman, but closer to the hitman. They may have gone to high school together.
My wingbro and I have downed more birds than a redneck during duck season.
by brold July 16, 2009