"to juhn" one's hair is to use semen as hair gel, either as a fetish or if an alternative form of gel is not available. This was made famous in the 1998 movie "There's Something about Mary".
"Look at Sam. He really juhned his hair."
"Those greasers look like they have juhned their ahir."
by Marky Choi October 30, 2010

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