When you cover your partners ass in powdered sugar or cocaine, and eat said partners ass. For it to be a real Russian Powder Party, you need to have at least three other couples participating.
James: Dude how was the date?
Mark: Amazing, after we ate we went to my place and me her and her friends had a Russian Powder Party!
James: Nice!
An social occasion in which two or more persons of various distant Slavic descent meet and consume small or large quantites of alcohol and\or marijuana and then proceed to communicate in different linguistically distant Slavic languages with only partial understanding between them.
Slavic Power Party example:
Polish: " Nie rozumiem o czym ty mówisz"
Croatian:" Ne razumiješ o čemu ja pričam?"
Polish: " Czaję, że mnie nie rozumiesz ale czy ty czaisz , że ja nie rozumiem ciebie?"
Croatian: " Ja razumijem da ti mene ne razumiješ ali ni ja ne razumijem tebe, razumiješ?"
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"