1) Befooling 2) Making a fool of 3) Taking in 4) Video game cheating 
[gaming] Duping refers to the practice of exploiting a bug in a video game to illegitimately create duplicates of unique items or currency in a persistent online game, such as an MMOG. Duping can vastly destabilize a virtual economy or even the gameplay itself, depending on the item duplicated and the rate at which duplication occurs. Moder...
• (p. pr. & vb. n.) of Dupe