When one disappears for a long period of time and goes unnoticed by the people they are with, and then spontaneously appears at a later time.
John: Hey guys, lets go to the movies
Bill: Alright, Cool
John: Where's Sam?
Bill: Come on we're going to be late
....after the movie
Bill: Oh man that movie was so funny
John: Yeah that was the best thing I've seen in a while
Sam: Oh man guys that was so cool.
Bill and John: Oh there you are Sam! You must have been Disa-perry-ing on us again.