An ink pen that had dried out and/or become useless and obsolete. Also see plencil
Rick: Dude, why won't this pen work?!
Mick: Prolly because it is now a plen.
by GIR needs rehab August 26, 2008
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Cailan Plen is a diplomatic masterpiece of a human being. He is for the people and will lead your country to greatness. If you see Cailan Plen he will inspire you to do greatness and make someones day.
Oh look its Cailan Plen he is the best.
by GailanClen August 4, 2023
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Commonly used as a low-key roast in Genus PvM, usually targetted at Benson or Seca
Plenson has logged in

"Oh look, its secaplen"
by EmilyHeartEyes August 7, 2017
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A flaccid penis, usually very soft and small. Plen is not a sexual term, rather a term of endearment.
Plens can be considered cute under certain circumstances.
"Did you hurt your plen again?" "- yes, my plenis got caught in the door."

"Your plen is so soft and squishy."
by Atlum August 21, 2018
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