Adjective. This is used to describe
* someone that loves their guitar
* someone that have sex with their guitar
* someone that loves guitars and people who play guitars such as matthew bellamy from muse.
* someone that is interested in the mechanical side of guitars and generally guitars.
omg... Matt Bellamy has sex with his guitar!!!
guitars are so cool
gosh you are such a guitariac!
Emily : i love matthew bellamy Dom : oh.. well i love him too! sooo much!
Katy : you two are such a pair of guitariacs!
The look of sheer ecstacy on one's face while playing a guitar solo - usually triggered by a long, sustained note or bend. Looks very similar to the person's o face.
"Dude, check out Miles. He's having a guitargasm."
"I was playing a JEM through a Peavey JSX the other day. I almost had a guitargasm on the spot - didn't even have to take me out to dinner."