If a boxer has to pee after leaving the locker room...

[BUNGALOWS]

There have been a few instances of fighters just taking a piss in the corner, and the corner men would pour water on them to mask the piss.

I forgot which fighter said this, but I remember watching an interview on YouTube about it.

[Barn]

theres a built in pee bag and **** bag in the protector under the trunks. 85% of boxers during a fight piss or **** during a fight.

Where the hell did you get that statistic from?

As for the OP. I had this issue in both of my amateur contests and even before sparring. Toilet nerves have always been something I've had to deal with in sports . In order to address the problem I always go for a piss and **** test before I'm going to be doing any sort of fighting and try to get into a routine in the weeks beforehand so I'll do my ****/p*ss about an hour before I'm due to start boxing.