Telling a friend to slay basically means to go like boosting them up in a slang way
Oh my god they've been tranding for days, they definitely slay!!
Look at all those views and comments, the're slaying!
slay is a word that can be used in any context. it means to be great at something or can just be used as a way of saying ok or yes
Person 1 -“hey omg did you see larray’s hair today??”
Person 2 - “omg girl show me “
*person 1 shows pic*
Person 2 -“ omg slayyyyy he ate that look very slay”
Slay means to be a baddie. To impress a lot of people or amuse them. I someone says you slay be proud.