A type of prank in the form of a video that shows a scene of normal life (sometimes a scary scene) until being interrupted briefly at the end by a monster, creature, or person jumping up in front of it. This is to potentially frighten the viewer from the abrupt changes.
JumpScare: When your walking behinding a person with a killer booty and your like, Oh Damn! Then they turn around and are so ugly you jump in shock and disappointment.
He got down with JumpScare. Wait, what is a jumpScare? You know a girl with a really fine ass and then they turn around and is ugly as fuck.