Mutual admiration of another man's moustache. This often occurs during 'Movember' (a new initiative whereby men grow moustaches during the month of November in aid of male charities).
During this period men can often be found having deep and meaningful conversations about their new facial hair the toilet.
Dude, did you check those fags having momance in the pisser?
Yeah moustaches are so gay.
Ewww those guys look like rapists!
Yeah they're having momantic moment.
The secret Love relationship between 2 contestants (Mo Chocolate and 8-bit Mickey) on The Tester. We found out about this on the episode that 8-bit Mickey got kicked off.
That wasn't know Bromance, that was a Momance