Yyurr comes from casual street slang used as an attention-getting hello, especially in call-and-response greetings where the drawn-out delivery matters more than the spelling. The exact recording and original poster of this short clip are not documented, so it spread mainly through soundboards, short videos and reuploads rather than a single credited source. Online it sits alongside other one-word reactions like a bruh moment and fits naturally into collections of goofy ahh sounds, which helped it circulate as a quick entrance and hype effect in meme edits.