A nicer way to say you are an idiot, or a retard.
E.G. "OMG you are such a muppet!" or "Haha you muppet!"
You could use this when talking to friends if you don't want to use something as harsh as idiot.
"Well, it's not quite a mop, it's not quite a puppet, but man... " - Homer Simpson
That explains it all
When one person sticks his hand up the other person's anus and the person with the hand in anus does a "Kermit the Frog" voice.
"Hey, how did it go with Katie last night?
"After 5 minutes we were fisting and after 8 we were muppeting."
"Oh nice!"
Someone who is usually an idiot and doesn't know much about anything // stupid
When one who holds muppet-like qualities turns snarky, vicious or militant.
This quick, violent reaction from an otherwise peaceful (and somewhat slightly dull being) tends to be an automated response to those who feign intelligence or sexual prowess.
Alternatively, it may just simply be a muppet cutting sick. And so muppets should.
You're being rather muppetant don't you think?
Is something wrong with Tom? Nah, he's just having the muppetants.
"I don't care who you use, as long as they aren't complete muppets." Harry the Hatchet, Lock, Stock, and Two smoking Barrels, 1998