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."
When you have smoked marijuana ,gotten stoned ,high or smoked a doobie and you find it hilarious.
That joke you just told was highlarious!!!
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!
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
Something that is only funny when you are high.
Any joke on Everybody Hates Raymond is highlarious.
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..."
when your a bit buzzed and you hear something funny..
man that was frikken highlarious!!