"Slay" is commonly defined as a word used to describe something or someone who is doing a pleasingly well job at something or if their outfit looks good, etc.
"OMG! Brittany you're slaying this presentation!" Or "Slay queen".
An absolute utter mistake of a person thinking that they are right, leading people to be like:
"nah, jit is trippin" or "jit trippin' dawg" meaning the other person is incorrect and looks like a ducking clown.
Being Sigma usually means you're OP or better than others.
Person 1: "Aye bro! You're so Sigma for that"
Person 2: "I know right, Skibidi Rizz is so unmatched I'm Sigma ong!!!"
Gyatt is a term that commonly defines (usually) a females gigantic phat booty. Sometimes used with Men too.
"Oh My Gyatt" or "I gyatt something in my eye!" when someone sees a big juicy buttocks.