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1.
To talk about some shiznit and think you know about said shiznit but really you don't know jack about said shiznit.
Shorty B was discussing the illuminati, when it was pointed out that he clearly didnt know what he was talking about and was called out to be an Inkhorn

"Shorty you're an inkhorn!! you don't know shiznit!!"
by bluegrasshole October 08, 2012
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2.
someone who does a lot of writing. usually with a fountain pen, like an old fashioned scribe. Nerdy, geeky that kind of thing.
"you going to that party tonight?"
"nah ive got to do my physics"
"god damn you, you're such and ink horn!"
by plonk October 30, 2007
2 4