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Gerna is a sentance filler/enhancer used in Northern California dialect, specifically Humboldt County. Sometimes used at as a substitute adjective like "shitty" or "crappy". The higher excitement level, the more frequently the word appears in a sentance.
Moderately excited usage: "That darn gerna cell site ain't gerna no good."

Highly excited usage: "Gerna darn gerna gerna cell gerna site gerna ain't gerna no gerna good."
gerna by DJ Dan K March 27, 2007
Related Words
Disregard any other definition. Genae is a wonderful, caring and gentle girl, who cares for others much more than herself, but she can also be quite cunning, sly and persuasive when she wants to be.

Genae is stunningly beautiful. Guys swarm around her. Get the upper hand by guessing her name ;)
"Dude, you know that Genae?
"You have no chance with her. Give up, dude."
"Well, I just hooked up with her."
"Asshole."
Genae by Erebraw November 22, 2011
An illiterate's spelling of the word grenade.
Idiot: zOMG THROW TEH GERNADE.
Smart person: Gernade isn't a word in English, did you mean grenade?
gernade by KnowsEnglishWell October 23, 2012
1. To laugh appeasingly at someone's jokes.

2. To pacify a situation with falseness or fakeness.
Will was forced to gernate everytime he talked to his relatives.

His laugh sounded forced and insincere; it was clear that he was gernating.
gernate by dvn June 11, 2006
Gerae is a word used to describe a girl who is extremely crazy (in a good way) likes to have fun, beautiful, athletic, and breaks out in dance in the middle of stores.
Oh my goodness that girl is GERAE!
Gerae by GIGI5488 October 18, 2010

Gernasium 

A gernasium is a word used to describe something that doesn't have something to easily compare it to, or can be used when you are at a loss for adjectives in the midst of making an important point. It can be used to bolster your pseudo-intelligence by using a made-up, yet smart sound word.
"It was freezing today..it was easily as cold as..a gernasium."

"Did you see the way that gymnast spun? It was something of a gernasium!"

"How do you feel about bread pudding?"
-" The truth is that bread pudding is something of a gernasium for me."
Gernasium by sdcabp May 28, 2011