This is the definition according to Wikapidia
A bromance is a close, emotionally intense, non-sexual bond between two (or more) men. It is an exceptionally tight affectional, homosocial male bonding relationship that exceeds that of usual friendship, that is distinguished by a particularly high level of emotional intimacy.
2. The act of wooing a fellow male friend for the purpose of becoming closer.
3. Going to unusual lengths in an attempt to become closer with another male friend. -