A wiener leaner is when you adjust you wiener to the right position so that you are comfortable.
"Wait man I have to adjust!"
"I get it, you just have a wiener leaner."
"Nobody wants a wiener leaner."
When something gets you sort-of aroused. Your dick starts to get hard and leans to one side.
She bent over and I saw down her shirt. I started to get a leaner wiener.