This is a vert skateboarding
trick. It is a hybrid grab
trick, though the flip dominates it, and hence the name. The trick was invented by Sandras "Sally" Augusto, a very old school
skater (I only discovered this recently). I have no idea why they nicknamed
him Sally though.
Do a vert ollie and make sure you get some height. Now do a pop shove it but push it out in front of you at the same time. Also reach down at the same time and as it completes its pop shove it grab it on the kick. For style fling your arm out, but only if you have the height. Now throw it into a pop shove it with your hand and make sure it is under your feet so you can catch it and ride back down the transition.