When you're feeling the jiggy jiggy so you approached your girlfriend in the basement and scream "I know what we're gonna do today!" and right before she gets to resist, hopelessly crawling away from you, you insert your tallywacker so deep(any holes will do) It can't be seen anymore, and you whisper in her ears "Where's Perry?"

Legend says it is also a famous line from Phineas and Ferb that whenever they got an Idea to 'what they're gonna do today', their pet platypus named Perry will suddenly vanish to a secret mission. LAME...

Invented in Borat's movie. It is said, when something great happens.