I get hella stoned and watch Foodfight! at least once a year. It’s my “favorite” movie.
Everything about it, from the implied beastiality between Charlie Sheen and Hillary Duff, to the weird gay bat, to the shitweasel 
is a masterclass in what not to do in a movie. It transcends badness and becomes something sublime. The entire plot is about how store brands/generics are Nazis, and one of the Nazis absolutely chews the scenery in a way that makes Brian Blessed look reserved.
They Live and From Beyond are some of the biggest turds that I love dearly. To a lesser extent, The Room.
Not yet seen mentioned:
UHF - Weird Al’s good-bad classic
Spice World - The Spice Girls knew what they were doing.
Shaolin Soccer - Yes, Ninjas would be good at sports.
Stuff I haven’t seen mentioned yet:
1984 Dune. It’s one of my favorite movies period.
Return of the Killer Tomatoes is on my top 10 favorite bad movies I’d say. Top 20 at least.
The Tune (Bill Plympton movie).
Clue (and very similar Murder By Death)
Empire Records
Cool as Ice (Rifftrax edition)
Actually, on that front - The Room + Birdemic (Rifftrax edition)
Zardoz
Original Little Shop of Horrors
How is Clue bad?!
Alien Resurrection. You just can’t watch that garbage without laughing.
Kung pow! Enter the fist.
idk, morbius?
Shark Tale
The Cat in the Hat (2004) is my pick. I loved it as a kid and I still love it as an adult. Lots of humor for all ages and all the practical props and sets are so neat.
August Rush, it’s not even a genre I typically enjoy and it’s so cheesy but I’ve watched it a bunch of times.
Super Mario Bros. 1993. It is by far the movie that puts the biggest “fun” smile on my face, especially when watching it stoned. It’s so goofy in the best way and comes across as funny in a way that makes me have fun with it every time.
I mentioned Rifftrax in another comment, but the Rifftrax version of this and Street Fighter are two of my favorite things ever.
the amount of slime in that movie makes it impossible for me to watch stoned. Like, if I got that slimey, while stoned, I would be freaking the fuck out. Great movie though. I still love John Luigi-zamo
Another one: Orgazmo https://en.wikipedia.org/wiki/Orgazmo
By the guys of South Park.
The warriors. I love it. I don’t care how silly it is. Normally I don’t do musicals but the awful bugsy Malone with the pie fights. We had to watch it at school and it cracked me up how ridiculous it is.
Killer Klowns for Outer Space
Freddy got Fingered
The Riddick Chronicles. Bad acting, bad CGI, Simple stupid inconsistent plot, one dimensional characters. perfect bad sci-fi.
I have a real soft spot for how absurdly bad/good those films are.
I liked them and have seen far worse. But to each their own.
