1. When someone says one thing but means another

2. When someone does something that annoys you or something that is not to your liking
"Olivia said she loved Chris but said she'd sleep with Mike"
"Damn that's so muggy"
by El-Gee July 18, 2017
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Used to describe a situation where someone has been made to look a fool or been "mugged off". A person can also be described as muggy if they are responsible for making someone look a mug.
Chris : he's just walked in and stolen my bird. That's well muggy.
Mike: Did he just call me muggy?!
by RandomT July 15, 2017
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Proper noun; a person who is bullshitting, but with great skill and humour and sounds like they might be telling the truth, but something indicates a lie based on the entire story in context.

However a perfectly valid story can earn the teller the appellation Muggy in order to dis them or cause general laughter in order to change to a lighter mood. Calling Muggy usually means the caller has to explain why or bullshit in return. Friendly arguing ensues with increasingly clever insults.
He said (with great earnestness) I sat there after the party and damned if I didn't look up just in time to see a strange object go across the sky. I'm not the only one who saw it, so and so were there too!

Friend says: Muggy (need to draw it out with drawl Mawwwwwgeeeee) I wasn't even there, and you were drunk out of your tree.
by Rogiemogie May 5, 2011
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The act of smothering the face of a sexual partner with the scrotum.
"I did an Arabian Blindfold on her, actually, it was a Muggis, it was too clumsy to be an Arabian Blindfold."
by Yak Daddy February 5, 2012
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When an inmate smiles for a mugshot like it's a selfie destined for instagram.
Meredith usually smiles in her muggies because she's been arrested about seven times and she knows it's the first thing that shows up when you do a Google image search on her so they better look good.
by Septmama September 8, 2017
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(adj.) Used to describe the atmosphere when humidity is high relative to temperature. Nights after humid days tend to be muggy.
The muggy air made even the lightest of sheets awkward to sleep under.
by phantom oddity May 28, 2004
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