Ur'in Urine is a term said to someone who's wearing a onesuit, and accedentaly wet themselves. Following the patterns of molecular diffusion, the pee spreads through the fabric and will eventually soak the whole piece of clothing.
Haha, you wet yourself in that onesuit and now Ur'in Urine.
Ur in a helicopter (short for urine helicopter) is the term I made up for when you twist a guys dick and let it go as he urinates and the fluid spins in a spiral as his dick unwinds. Think of a liquid Meatspin if this doesn't make sense.
One guy says to his gal: the "ur in a helicopter" you gave me last night was sensational
she replies with: I'm glad you liked your "ur in a helicopter"