shut the fuck up lmfao.
First of all a fullwhip is when you do a tailwhip, and while the deck is still spinning, throw and catch a barspin, then complete the tailwhip.
The trick is exactly like a rotowhip except for a fullwhip the deck and barspin spin in the same direction while for a rotorwhip the tailwhip and barspin go in opposite directions.
Now, this trick is all about repetition (wait, isn't every trick?)
You have to practice the rotation of the tailwhip and throwing the barspin just standing up and whipping your scooter around before you take this trick to flyout or whatever. Similar to how most people learn to catch barspins.
Once you take it to flyout and actually start trying the trick, you need to make sure to stay with your chest prety much right over your bars or close to it and you need to make sure the whip stays under you. This will prevent the deck from flying away or you from landing with all your weight back, causing you to fall in most cases.
Honestly, haven't landed one yet, but that's all the advice I've seen about them. I can throw the rotation perfectly, just haven't committed to learning them yet. I reckon I will now.
If you want some examples of who does them and what they look like:
Issac Miller:
The fullwhip is at the end and he does an extra whip
http://www.youtube.com/watch?v=nfnKkF9xWmE
And also Cooper Klaar does them really, really well.
Another fullwhip, this time on flat, at 0:11, then a fullwhip to whip flat at 1:22
http://www.youtube.com/watch?v=odBK-xfp5-U&feature=channel_video_title