When one "bro" makes a decision and all other "bro's" follow immediately.
When "bro's" can't think for themselves because they have too many "bro's" thinking for them.
***1 minute later: Facebook relationship status of Bro #2 is SINGLE***
Bro #2: Bro, I'm now single, let's find slammin biddies!
Ex Girlfriend: My ex has bad case of B.I.B.S!