A fancier word used when saying yes or yep. Much more fun than the usual "yeah". Mostly used in text messaging or internet conversation. Derived from the root yerp meaning yes.
Guy - "Hey, are you going to the party tomorrow? :)"
Girl - "Yerple! Are you? :)"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.