Freshman PeePee

An undergrown, prepubescent male penis on a freshman in high school. Some freshman boys have not progressed far enough in puberty, causing them to have small, under-developed penis (PeePee).

Angela-"Hey, did you see Cullen?"
Erica- "No, what's so important about them?"
Angela- "He have freshman PeePee and I saw it."
Erica- "No fucking way!"