Being one of the longest words ever, it is used to say before doing a rickroll. Especially if they don't know what a rickroll is.
Person A: Yulicranyisitiphoniaey/
Person B: What?
Person A: NEVER GONNA GIVE YOU UP NEVER GONNA LET YOU DOWN!
Person B: What does that mean?
Person A: You'll know in the future!
10 years later...
Person B: THAT LITTLE PIECE OF-