A vaporizer, or E-cig. Named so because socially they function identically to fedoras, ie. users think they look cool and rebellious, when in fact the opposite is true.

In at least two cases they are worse than fedoras, as the huge clouds are far more obnoxious and its hard to get a vapist to shut up about his rebuilt atomizer and sub-ohm bullshit.
1: Is the fog rolling in off the lake?

2: Nah, just some mouth fedoras on the corner.
by spenndiagram December 12, 2015
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If you've googled this phrase in a fit of righteous indignation in defense of your stupid hobby, then I'm sorry, you are one of them, and you can't be saved. You blow obnoxious, pungent, sickly-sweet clouds indoors because "It's okay, it's not smoke!" You spend inordinate amounts of of money on mods and oils for the sole purpose of showing them off to people who really don't care. In any kind of social gathering, you position yourself where you will be the most visible, yet try (and fail) to appear nonchalant and aloof in an effort to attract the curiosity of some poor unknowing sap, or even worse a fellow mouth fedora connoisseur to pollute the air with at double the efficiency.

You vape. We get it, and we hate you.
Bill: Check out this new oil i bought! It's cotton candy flavored! It's really good!

Ted: Could you please not? I'd really rather not breathe that shit, if you don't mind.

Bill: Oh but it's okay, this isn't smoke! Vaping is so much healthier than cigarettes. It has nicotine, but it doesn't have nearly the number of other chemicals so you still get to enjoy smoking without the guilt! Just the other day I dropped $80 on this mod tha-

Ted: I don't care. I just don't fucking care. Take your stupid fucking mouth fedora and get away from me you pathetic attention whore!
by BarChordPunk March 7, 2016
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The type of douchebag that thinks he's high class and mis-uses large words such as platitudinous and subtly attracts people's attention so people don't forget that his tragic existence is present in a modern society.
Take a look at that mouth fedora talking about his high school debate career.
by Tripod Launchpad October 18, 2015
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