A form of mulling (over) a particularly difficult (or gruelling) decision, concept, or thought. Muelling is often but not exclusively performed by any person with the surname: Mueller, Moeller, Miller, Müller, and/or Möller. Muellers (not to be confused with the subset of all people with the surnames Mueller or Müller (disambiguation)) often exhibit the following symptoms while muelling: muttering under one's breath, feverished pacing, leaning head-first into walls or tall objects, muffled sobbing and/or gasping, and repetetive uttering of nonsensical words, phrases, or numbers aloud.

The root of the word can be traced back to when German millers (surname being Müller) would lead domesticated animals/hairy-ass-slaves (yes, both stresses of the phrase are correct) around a circular track, spinning a large stone wheel over a slab covered with grain to produce flour. As Milling is often considered the origin of the word mulling, it can be said that millers would mull while the mules "muled", leading to the true root "mule" (often misspelled as "muel"). Therefore, the most correct depiction (should) be of a mule laboriously turning a mill, sadly ignorant FUCKS just think about a fucking "mule pacing in its cell, as if in deep thought". Go figure.
Alex was last seen muelling over potential ways to propose to his girlfriend.

Once, James mulled very hard. He was borderline muelling.

"Shiiit dawg, if you don't quit muelling soon, yo head will pop."

"I knew that Mueller muelled a lot, but this time I think he's gone too far."

"I muelled so much over which chick to bang last night, I got a migraine."

"How much mule could a Mueller muel,
If a Mueller could muel mule?"

Alex Mueller muelled furiously to meet the weird requirements of the content moderators. After long muelling into the night, his definition of "muelling" finally made it into urban dictionary.
by flung fist February 15, 2019
Get the muelling mug.
The act of blowing compressed air into a whores anus and having her hold onto the false fart whilst you pack in a few grams of Columbias finest. She gets into position and let's rip over your eagerly awaiting conk. You get a nose full of the good stuff and a lung full of the bad stuff.
I've got a few grams left over and a couple of coins spare. How about you come over here are be my fart mule.

I'm beyond snorting off a hookers backside. I'm more about fart muelling now.
by Uncle Nastyfingers November 25, 2019
Get the fart muelling mug.