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Surname. The American version of the name Muller, but with an Umlaut over the "u." Very common in Germany.
American Muellers can be the best people you will ever meet.
Person #1: "That Sarah Mueller, she's really great!"
Person #2: "She might actually be one of the best people I have ever met!"
by always true February 26, 2009
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2
Verb: to Mueller something/someone is to execute a deep lengthy investigation, usually in order to uncover the deepest darkest secrets and crimes of that thing/person, including and often specifically to find secrets unrelated to the original inquiry.
Frances: "Alright boys, fess up now, who took my lighter? Don't make me Mueller this shit and expose your vast collection of stolen lighters."
by bmb5220 May 22, 2018
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3
When having intimate sex and your penis goes flaccid for no reason.
I was having sex with my soon to be wife and I received a Mueller and she broke up with me. She then proceeded to have sexual relations with my friend Salinas.
by Rafael salinas March 04, 2014
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6
Something that goes on and on and on and on and never ends, but also never produces anything useful. Purposefully carrying something to its furthest extent to annoy another. Origin: The Robert Mueller Investigation. Also see MuellerGASIM, Muelldozed, Pulling a Mueller, Muelleresque.

Can be used as a noun or a verb.
Mueller (n): That line is a Mueller!
Mueller (v): I tried to Mueller that clerk, but he caught on!
by Gingy Yael August 21, 2018
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