Bromance is the combination of two words, "brother" and "romance". It describes the unique male bonding found between "brothers from another mother". This is between heterosexual males and no matter what is never seen as a gay relationship, though it may be joked about.

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Two straight guys that say I love you to each other while sober

The complicated relationship shared between two straight guys. It describes (one of) the highest levels of friendship that two guys can have without being gay.

Bromance - Loving another man in the most heterosexual way.

Describes the complicated love and affection shared by two straight males.

A close friendship between two straight men who share similar interests and views, to the point where their relationship would be mis-interpreted as romantic from the outsider.