(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.
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