yasslay
a portmanteau of the terms yass and slay. The word is typically used to describe an achievement, object, or person that is amazing, but can also be used ironically. YASSLAY in all caps is reserved for special circumstances only.
Person 1: Did you hear about how the science team captains Alice, Derek, Kathy, and Isaac carried the team to third place! That's so yasslay.
Person 2: I just lost a ton of money playing poker.
Person 1: YASSLAY!
Person 2: I just lost a ton of money playing poker.
Person 1: YASSLAY!