A bromestic partnership is when two males who were previously in a bromance upgrade to a higher standard of friendship and become bestfriends, brothers, roommates, etc.
Girl: aww you two have a bromance. so cute!
Guy: Its not a bromance. Jake and I are in a bromestic partnership.
Girl: Oh I didn't know you two were that great of friends.
Guy: Its not a bromance. Jake and I are in a bromestic partnership.
Girl: Oh I didn't know you two were that great of friends.
by dtf ROBOcop April 19, 2011