The genitalia (Not the testes, but the penis) of a man. "Johnsen" refers to the actual penis of the man, not the crotch, the testicles, or any other region.

If the person in question has several "Johnsen"s, then this person is referred to as "Johnsenrific".
"Look there, my children! That's my Johnsen!"
by Johnsen Johnsen June 17, 2009
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one who is fasinated with the male genitalia
wow look at that fag he is such a johnsen
by jeremy694/ January 22, 2008
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When you tie your girl to a ceiling fan naked, turn on the fan so she starts spinning. Afterwards you then strip down yourself placing your now exposed genitalia in the spinning girls trajectory, resulting in very small and quick rubbs on said genitalia.

It’s common courtesy of the male contestant to raise one leg as a sign of respect while the ordeal goes down.
I gave my girl a Dirty Johnsen last night, has to go to the ER right after for various reasons. But it was worth it!

I almost lost my dick while performing a Dirty Johnsen last night, calculated the trajectory wrong and almost got it severed.

My girl passed out last night during the Dirty Johnsen prolly cause of the constant spinning. Didn’t matter to me tho!
by Rodney's Airbnb April 16, 2020
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