When you make you hand in a cup shaped position and fart in it, shortly after farting in it you push it in your friends (or someone you don't like) face covering there nose and/or mouth.
It is a very good pranks and makes the victim smell your dirty farts.
This prank was origanally made from a Ukrainian prankster and it is like a gas mask when you put it on there face therefore it is name "Ukrainian Gasmask"
Slangs for this term include "The Dirty Ukrainian" and "Sour Cabbage Surprise"
Matt: Hey Billybob check this out ::gives him Ukrainian Gasmask::
Billybob: OWTF!?!?! that smells like shit!!!
Matt: Rofl lol!!!
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