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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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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 07, 2017
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