Reverend Leroy wished he'd worn his vestment as he popped a Woodrow and began pitching a tent while he preached a sermon on the evils of homosexuality to the assembled congregation.
To have an erection while lying down so that the sheets covering you pop up like a tent with a pole in the middle.
Peter: "Wanna go camping this weekend?"
Quagmire: "The only tent I'm gonna be pitching this weekend is...well you see where I'm going with this one...awwwwwww riiiight!"