(pronounced like "slay") Literally means Smiling Like An Idiot. A term to be used for those times when you can't help but have a stupid grin on your face. Usually used in the positive sense. Used very much like the term "lol"
Person 1: Hey, I hear you're going to the movies with Chris tonight.
Person 2: Yeah (with that idiotic grin)
Person 1: You are so slai.
OR
If you were in class, and it was a very inappropriate time to laugh, you might be slai.
Person 2: Yeah (with that idiotic grin)
Person 1: You are so slai.
OR
If you were in class, and it was a very inappropriate time to laugh, you might be slai.
by Tesla15 September 22, 2012
the guy out of your group of friends that gets the most pussy of everybody. All your friends want to be the "slay-slay".
by ammama June 19, 2006
by Sanayy May 03, 2016
by ItsAPolarBear June 13, 2016
by ComfortNugget September 16, 2014