I'm guessing that you've seen these, but I'll list them in case you haven't.
The World's End (Simon Pegg et al.)
This is the End (Seth Rogen et al.)
You might like the TV series, Firefly (the movie Serenity goes with it). It certainly has a lot of humor and it definitely has a post-apocalyptic element.

Hate leads to anger.
Anger leads to the Dark Side.
This is a Haiku.

Delicatessen!

THE DARK BACKWARD (1991) is not post apocalyptic but definitely dystopian and certainly weird.

someone beat me to "
The Bed Sitting Room (1969)
" and "
Sleeper (1973)
", so i'm forced to (reluctantly) add "
Tank Girl (1995)
".
"I'll do the masterminding around here."
-Sgt. Stryker, "Sands of Iwo Jima"

Seksmisja (1984)
is the masterpiece of the dystopian-comedy genre, imo.
I also second the
Sleeper (1973)
and
The Lobster (2015)
recommendations.

The Bed Sitting Room (1969)

Thank you, I've seen that one. Loved the premise and setting. You forgot to mention the rockers are cannibals
I should consider pairing it with Six String Samurai sometime soon.

Radioactive Dreams
http://www.imdb.com/board/10091818/combined
It's a really weird low budget 80s movie about two young men who grew up in a bomb shelter reading 1940s detective novels and developing their personas from that source. They go out into the post-nuke world and meet, among others, foul-mouthed little boy mafiosos, mutants, and Pat Benatar style 80s rockers.
Totally strange yet very funny. If you liked Six String Samurai, you will like this too. They make a perfect double bill.

Dark Star rocks imo. Haven't seen most of your other suggestions, so thanks, I got plenty to catch up on.

• Mars Attacks! - although it's more apocalyptic than post-apocalyptic.
• TV-show "The Last Man On Earth" - not much sci-fi though
• Zombieland
• The Lobster - not much sci-fi, not post-apocalyptic; but it is dystopian.
• Turbo Kid (2015)*
• Night Of The Comet (1984)*
• Bad Taste (1987)*
• Dark Star (1974)*
• Sleeper (1973)*
• No Men Beyond This Point (2015)*
  Titles marked with a * are movies that I haven't seen myself.

Thanks for replying, of course I've seen that one, that's an obvious pick I forgot to mention.

Idiocracy (2006)
should be at the top of your list. A human-hibernation experiment goes wrong, and the subject - an average guy - finds himself in an absurdly dismal future as the smartest person on the planet.
I've been ionized, but I'm okay now.