What does Bronage a trois mean?

Bronage a trois meaning in Urban Dictionary

When two bros choose include a third bro for their brolatioship. The third bro can move in using two present bros in their living space or he can adopt both bros into his or her own. Even though the three guys may all be completely heterosexual (see totally right), by this point one or more bro is usually in a position to willingly recognize himself as being bromosexual.It derives from french "menage a trios" (indicating family of three) and english "bro".