Padadger
A padadger is like a boner that just randomly shows up when you're not ready for it. It's like your junk is being a total jerk.
I got a padadger during my mom's birthday party. I felt like a total idiot.
My friend got a padadger in the middle of a conversation. He looked like a fool.
I got a padadger in the middle of my shower. I almost slipped.