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Combination of "pinhead" and "(Jeremy) Lin," point guard for the New York Knicks, it refers to a person who knows nothing about basketball but makes outrageous statements about Lin and the Knicks after seeing little to no basketball before Lin's breakout success.
"Jeremy Lin is the best point guard in the NBA and he's going to lead New York to the title this year."

"He's fun to watch, but he's not the best. Anybody who's watched more than the Knicks' February games knows this. You're such a Linhead."
by Jo Jo English February 23, 2012
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