The exploit is a combination of two exploit here
http://www.mmowned.com/forums/world-...l-dalaran.html
http://www.mmowned.com/forums/world-...t-dalaran.html
(if you liked any of them, make sure to rep them too)
result = http://imgur.com/a/AfaOY
Its fairly straight forward, but one of the problem with becoming collosal in dalaran is that you are always sitting down drinking(or you may lose the buff if you get drunken a few times in a row). Add in the parachute, you are drinking while standing up, making you at your full size the entire time.
and having a giant parachute / balloon ontop of you is also a plus, enjoy