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p3ni5 is a sneaky way to say penis when you're too lazy to type the whole word and too scared to get caught swearing.
My homie texted me 'I'm gonna go p3ni5 the day away' and I laughed so hard I snorted my soda.
She wrote 'I saw the principal p3ni5 in the hallway' and got suspended for it.
He posted 'Don't p3ni5 on my homework' and got 10 likes from the class.