The art of sticking your nose into other's business. Not only does the perpetrator muddle in the affairs of others, but often times is a trained expert in fucking everything up along the way as they do so.
A true fuck muddler can be a devastating force to be reckoned with.
Hey, have you seen Brad around? He's got a tendency to go around fuck muddling.

Last time I talked to him he fuck muddled his way into my sister's wedding. The dude ruined the whole thing. Prick.
by WordPoet December 8, 2014
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A person who muddles in another's business behind their back.
You guys are muddle fucks because you did it behind my back; I muddled in the open, everyone knew and now shit ton more people know.
by PineappleJuice March 26, 2015
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