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Jumping headfirst directly into a hobby you have previously no experience in whatsoever, all while pretending that you've had years of experience in it.

To become overly enthused about a particular type of hobby, by using topic-specific web forums to bolster your knowledge of the topic at an accelerated pace.
"hey bro, me and my buddy went to the shooting range yesterday...I'm henzin now. Ordering a Barrett .50 cal tomorrow bro"

"Dude bro, I got this badass German Shepherd the other day. I'm already totally henzin on dogs. I'm preparing raw food gourmet meals for her, and I'm going to start breeding and professionally training Shepherds for law enforcement / military work next week.
henzin by krevo81 March 2, 2010
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henninen 

Soulja Boy's way of asking "what's happening?" because he can't speak properly from sucking Arab's dick everyday.
Soulja Boy: "Arab, was henninen?, come here so I can suck your dick."

Arab: "Okay Soulja Boy Tell Em. Just don't grab my booty meat."

Soulja Boy:Yuuuuuullllllle!!!
henninen by Jungleduder June 23, 2009
Related Words
A given name mostly used in Germany and Scandinavia. If your name is Henning, you're probably extremly hot and incredibly good in bed.
Have you ever had a Henning before? No? You're missing out...
Henning by missJeniffer February 16, 2010

mother-henning

When someone (often a roommate) is all over your shit, such that you can't even breath.
When I came home at 3 pm after a night out, my Roommate Becky started mother-henning the crap out of: where did you go? what did you do? who were you with? Fuck. I need to move out.
That guy sits around all day watching anime... he is henjin
Henjin by Smurfeater May 3, 2009

Hennings Rule of 40 

The useful and highly strategic approach to lectures/class in university. By going to class you must take 50 mns worth of notes as opposed to later copying said notes in let's say 10 minutes. 50-10=40. Hennings rule of 40
You going to that shitty law lecture Sam?? Nah, ill just use Hennings Rule of 40
A person with a big cock.
Gift from gods
He's dick is so big he's name must be Henning.
Henning by PURPLE_ARMY_CX November 25, 2019