1) Refers to someone who smells like a mixture of cat piss and Don-Russ Baseball Cards. This person can be an "Ucky Muckster" as in a noun or the person can be preforming something like a dumbass and he/she will be acting "Ucky-Mucky".
Other terms for Ucky Muckster:
* Ucky Mucky
* Mucky Duck Sause
* Murky Dish Water * Baby Mucktar
* Muckstar
* Ducky Muckdumpster
Dave smells like cat piss and Don-Russ Baseball Cards, he's such a fucking Ucky Muckster.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.