When two bro's decide to take their broship to the next level. Usually involves them buying an apartment together, or a cottage out on the beach for a summer, while still remaining straight as an arrow.
Bro 1: Bro, we need to talk.
Bro 2: Yeah, bro?
Bro 1: I think we should take this broship to the next level. Wanna room with me at this awesome apartment?
Bro 2: You mean... you want a brolationship?
Bro 1: Yeah man.
Bro 2: Alright, bro.
the deep connection between a climber and his/her belayer. the importance of this connection is usually expressed by the amount of time spent together in a gym or on a rock.