A Knobble
A tiny pecker. Like the size of a pencil eraser. You’re still a kid and your pecker is barely showing.
"That kid’s knob is like a pencil eraser.", A guy in the bathroom
"He’s got a knob like a tiny pencil.", A guy who’s seen it all
"I have a knob like a pencil eraser. I’m doomed.", A kid who’s too small for his own body