What is the nature of their relationship?

Seme and uke

The same as me and your mom uhuhuhuhuh

One time I drew Butthead with Daria hanging out like burnouts and people got mad at me for "shipping a gay man with a girl"

Sonic fans.

They're always trying to fuck every moderately attractive woman they see, how are they gay?

That's what I'm saying!

Teenage friendship. They like the same kind of music, they make eachother laugh, nobody else wants to hang out with them regularly so they're stuck together.
Congratulations Beavis.

some people don't understand sibling-like bonds because they have no siblings themselves (and in most cases, they don't have any real friends either)
they assume every close relationship must have progressed from acquaintanceship directly into romance

Creepy

They have different mothers and different fathers. I think their mothers were both hookers.

Yeah but you can have a brotherly relationship to a best friend is what I mean

I always saw it as a family friend situation, like theyre dad's were buddies and so beavis and butthead hang out a lot because of it. They may as well be related, but they biologically aren't.

It feels weird to me as a third party to describe two guys as brothers when they aren’t related on paper or by blood. It’s like just casually referring to a couple as husband and wife when they haven’t actually married. But if Beavis or Butthead call one another “brother” as a term of endearment because they see one another as brotherly friends, that’s totally normal.

They're cartoon characters

They pretty much establish in the movie that their dads (who happened to be best friends) were a couple of johns who had absolutely no involvement in their sons’ lives. If anything, it’s possible that their mothers were friends, or work associates, or something, and that’s why Beavis and Butthead apparently grew up together and maybe live together.

Honestly, I was always sort of unclear on how Beavis and Butthead even manage to survive when they’re highschoolers who seem to be too stupid to take care of themselves but we also never see anybody else take care of them. So I always kinda wondered what role their mothers played in their lives. Like, somebody must be cleaning their house at some point and it’s hard for me to picture either boy doing that. Maybe the animators just didn’t want to draw a lot of clutter, though.

Maybe they were just destined to become friends like their fathers. I try not to think too deeply about the realistic aspects of a cartoon, especially if its never been publicly shown or discussed by the creators. At a point it becomes a discussion of fanfiction.

Deeply sexual

Vitriolic best buds

They're a happy, retired couple

If Beavis and Butthead fuck each other, then how come they’re constantly complaining they never score?

Because, like, it only counts if it's with a chick
What a dumbass

If it doesn’t count and they’re both still virgins, then how can they be gay?

Sam and Frodo are gay, right?

This image makes me oddly happy

Their friendship is kind of beautiful in a way. All of society either ignores or rejects them. They're broke, stupid, ugly permavirgins with no futures. To anyone else they should be miserable and unlovable, and yet they've found a lifelong happiness and connection in each other's company. We should all be so lucky.

Uh.huh huh...gay!

uhh huhuhu would like... shut up or something? uhh huhu

An abusive one, but neither Beavis nor Butt-Head would ever realize that.

homosexual

The 2022 show expands on that by establishing that the house belongs to Beavis' mother. Beavis refers to her living with him but she's never seen/

A friendship I genuinely envy

They're friends, probably ended up being friends because nobody could stand their shit.