Forte of Titles

Always do I ask,
"A peeing-up competition"
And follows,
"But how?"

Simple, really.
We'll use that fence.
It's wooden,
Should do the trick.

You pee up, I pee up.
Then we check

"How high did you get?"
I got to my chest.
"I got to my shoulders."

Or we can play the other way,
First one to their own mouth wins.
And they always think I'm being facetious.

That sounds like loser talk to me,
and lucky too.
I've finished,
with an end rhyme to pee.