There isnt exactly anything as “proper yiddish” anymore
Most languages (except english) have institutes that determine what words are deemed to be words in that language, they also determine proper spelling and grammar. The Yivo is the institute for yiddish, however the people who mostly speak yiddish today do not care what the yivo says, so if a word creeps into yiddish in the chassidic world and the yivo says not a word , they dont care and they will use it anyway.