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1.
So much bro, the atmosphere can not handle it.
In today's forecast: sunny with a 30% chance of a Bro storm.
by Openslot November 10, 2011
 
2.
When someone is being extremely bro like or an area(usually bon fire parties, regular house parties, or local venues when scene bands are playing) becomes ridiculously over run with a large amount of bros and bro hoes in a extremely short amount of time
"We had 2 full kegs of Bud Light until that Bro-Storm occurred."
by Dejackamo Von Rictor May 24, 2007