kidney shy 

adjective describing the delayed ability to urinate in a public restroom, usually caused by the misapprehension that other people will hear you pee.

Woman returning from the restroom on Girls' Night Out: "Sorry I took so long. There were so many people in there, I got kidney shy."

kidney shy by N. Fritz May 9, 2008

shy kidneys 

When you can't pee in the presence of other people.

I can't piss in this urinal, because i have shy kidneys.

shy kidneys by blinded October 7, 2008

kidneyshift 

where by a man inserts his penis into another mans anus so hard that it shifts his kidneys

'matt came round last night, he gave it to me like a buckin bronco and gave me a kidneyshift'

kidneyshift by Diana Ross April 18, 2007