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1. Adjective

Describing someone as "Muscular" or "More Muscular" quickly and under your breath. (Usually to a nearby confidante)
Pssss.. Psssst... look grrrl he mustler than Taylor Lautner!
mustler by GymRoomPeeper July 30, 2011
Related Words
A new way to identify Elon Musk and/or his followers
Did you see John's post? He's such a Mustler
Mustler by Idk135798 February 16, 2025
The person, space, or entity that centralizes all indispensable items, things, or even news. Derived from Must-Have.
If you don't know what items you will need after you have a baby, there are specific mustlers for this, usually an old babysitter or baby nurse ladies.

If you don't want to read that Harry Potter book sequence, ask John, he is a Harry Potter Mustler.

Google News is the Mustler of digital news. All the trending topics are there!
Mustler by John Trolho, Mr. March 28, 2025
To place your penis into the hand of an unsuspecting person. Most commonly acted between two heterosexual males.
When we were laying around in the TV room, Andy gave Tim the old Mussler. It was hysterical... but fucking gay as shit.
Mussler by trop142 November 28, 2010

musterbate

To sit idly and think.
"That is a lot of money. I will have to musterbate for a while before I make a descision."
musterbate by Shake Zula May 10, 2005

Muster Cluster 

When multiple dicks are being penatrated in a single womans vagina.
Bro! We had a muster cluster with Kate last night!
Muster Cluster by Mr. Jones21 January 23, 2011