Something that is funny only to people who are high.
High guy: "Dude that is so funny!"
Clean guy: "The chair is highlarious, yes, and you need help."
by Another teenager October 6, 2010
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When you have smoked marijuana ,gotten stoned ,high or smoked a doobie and you find it hilarious.
That joke you just told was highlarious!!!
by Redazzbaboon March 17, 2016
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1) when something is beyond funny

2) when someone is high and makes a funny joke
while we were smoking shiba yesterday, Martin said something Highlarious!
by Roxybaby00 August 4, 2005
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Something that it extremely when/because you are high.
Matt: What do you call an ugly slut?
Andrew: I dunno what?
Matt: You're girlfriend!
Andrew: That's freakin highlarious
Matt: It's probably because we're high
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Something that is only funny when you are high.
Any joke on Everybody Hates Raymond is highlarious.
by Joefry Reynolds December 24, 2012
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1. Something so funny it makes you feel like you've just dropped acid and got high on ecstasy at the same time.
Or:
2. Something so unfunny/dumb that you must be literally doped out of your mind to derpidly laugh at it.
Sober friend:"Dude, did you see what Dumbnuts just did? HiiiIIIIGH-larious!"

or, alternative usage:

Trashed friend: "BwahhahahahaHAhurdeehuehurheeehehehehaHAr, that is sooooooo FUuuuurrrnyyyheeheeehehehheeee *hic* lolololol"
Unamused sober friend sarcastically responds with mocking tone: "Haha, yes, very funny, Highlarious..."
by horrorjunkie August 16, 2013
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