The scoober is an advanced upside down throw often used for short, high passes (eg: throwing over a cup). It is thrown using the same grip and wrist flicking motion as a forehand but with the throwing arm across the body and the disc upside down. The thrower usually steps to the side as they would when throwing a backhand. Scoobers typically fly quickly for 5-10 meters then get an IO edge and plummet quickly. For throws needing an OI edge, a hammer is a good choice. A good alternative to a high release backhand for shorter throws. For longer throws needing an overhead IO edge advanced handlers might consider the thumber.
 Instructional Video
A 5 1/2 minute tutorial by Brodie Smith (BrodieSmith21) - How to Throw a Scoober