It originated from the name of the male reproductive organ. It is the same shape and in some cases it is probably the size of yours if you are a guy reading this. Don't get fooled by pen and penis. Don't forget to put a space after pen when it is followed by the verb is, otherwise you would have spelt penis. See exemple below.
That pen is miniscular.
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Get the pen mug.pouched egg nipples - When a woman has giant areolas that make her breats resemble pouched eggs. Normally resulting in stretched nipples.
by OMGWTF October 14, 2006
Get the PEN mug.pen-a fabulous female with dyed black hair(usually)and very artistic and intelligent a bit of a cassonova but when they find the perfect match they will settle and have a lot of children(3 sometimes 4)and will be very stubborn but with a good sense of humor
by beingthegiraffe February 26, 2010
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