Combination of "Heisenberg Uncertainty Principle" and "bro." A bro cannot be both a bro and a boyfriend/husband at the same time. If he's with other bros, he acts one way: usually vulgar and rude. If he's with his girlfriend/wife, he acts another way: sweet and charming. He can never act exactly like a bro if he is with both bros and his girlfriend or wife.
by Ae5Ea8 March 2, 2015
Get the Heisenbro Uncertainty Principle mug.The party was hopping but the Heisenberg Uncertainty Principle was is full play so who knows what will happen.
by SaintAmbrose July 29, 2022
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