Road trip bladder 

When your on a road trip and your bladder expands to twice its size and urination lasts a minute or more.

My piss lasted at least a minute after that 6 hour bus ride, I had total road trip bladder

Road trip bladder by Ohnoidied January 13, 2011

Roadtrip Bladder 

Being able to hold it for long periods of time.

"do you need to use the restroom?" "naw I have a Roadtrip Bladder."

Roadtrip Bladder by Daten-Shi May 12, 2015