A penis that is the length of the plank length. AKA 1.6 x 10^-35 meters.

If you suffer from Planckpenis, I recommend Walmart's $19.99 20-Pack Penis Enlargement Pills!
Person A: I feel so pathetic. I have a Micropenis!
Person B: *scoffs* You think that's bad!? I have a Planckpenis!!!
Person A: *faints in shock*
Person B: *cries softly*
by Mr OceMcCool October 21, 2022
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