1)A male testical used in the reproduction process. See Penis/Dick/Cock

2)A word made up in the 8th grade Algebra class through Mrs. Dean's innability to hear. First meaning a pen that went shhh. Soon to become known through a different deffinition. (See 1)

shh-The noise you make when your telling somebody to shut up.

pen-A writing object in which ink is used.