Hacked in a general, average Joe, term means to do anything that couldn't be done with normal use. Meaning if you can't do it wihtin the game it is hacking. Altering stats via external programs or giving yourself extra experience points or stat points is considering hacking. And remember the game comes with DDDK, Dungeon Defenders Development Kit, for the PC free and altering or coming up with new maps or gameplays is not hacking, but can't be used in TrendyNet.
NOTE:ANY HACKED ITEMS OR CHARACTERS OR ANY HACKING AT ALL USED ON PUBLIC TRENDYNET OR RANKED GAMES WILL GET YOU BANNED FROM THE TRENDYNET SERVERS. IT IS ILLEGAL TO DO.