Commenly used as a exprecion of exitment. Seeing something you like or think is cool.
For exampel your friend has been doing very well studing you can say : slay queen. Or on the street seeing someone you think loook coool or is doing something cool, you can say: slay queen
When you a bitch and then you leave but slayed prior to the leaving so you gotta like, like, so like, you gotta slay out, like you know? Out as in going outside or leaving.
Person uno; Omg you are so charismaticly annoying
Person two: (me) No, you are, SLAY OUT (SHOUT THIS)