Brophylactic

bro.phy.lac.tic |ˌbrōfəˈlaktik|

adjective

1. Intended to reduce brotient: Concerned about the growing number of males on the dance floor, the bar manager instructed the DJ to play Beyoncé, a reliable brophylactic intervention.

noun

1. A medicine or course of action which repels bros: Tired of getting hit on at the grocery store, Janice began wearing a fake engagement ring as a brophylactic while shopping. 
2. A person (male or female) who actively interferes as their female friend is courted by a male.  See also: cock-block

DERIVATIVES

• brophylactically (adverb): In retrospect, Elise realized that the chili-garlic-bean-burrito was, brophylactically speaking, a regrettable pre-date meal.