Mike Posner Jokes About Grammy Nomination

Mike Posner's got jokes but either the good folks at the Grammys don't get it or they REALLY get it ... which we doubt, but would be cool.

We caught up with the "I Took a Pill in Ibiza" singer Tuesday at LAX and he explained why his song getting nominated for Song of the Year is like the ultimate inside joke.

Mike -- who's also written for the likes of Justin Bieber -- is clearly enjoying the irony.