Yeet is a relation to the meme, THIS BITCH EMPTY. YEET!
"this bitch empty. yeet."
Basically, it is a slurpee. I used this word in asking to have one. Maybe you would use it as a short form, or just a funny word. In this example:
"Can I have a shlurp shlurp, Kailey? Kaitlynn asked.
"No, you can't hav a shlurp shlurp from Circle K." Kailey shot back.