To pick up an item although you cannot use it or don't need it.
*You recieve loot: Mega Uber Item*
*You recieve loot: Mega Uber Item 2*
*You recieve loot: Mega Uber Item 3*
RandomGuy: FU Ninjalooter!11 omfg wtf?1+ im gunna repotr u n wriet on teh forums!11 umg nublet!1
Okay, thank you, goodbye. Abbreviation thereof. Commonly used in a facetious or sarcastic manner to emphasise the rapidity with which the sayer wishes to both win and then leave the conversation.
Person 1: *ninjaloots items*
Person 1: kkthnxbai! *logs*
The art of ninja-ing an item without previously asking. Found commonly in MMORPGs such a WoW.
Dude, that guy totally took that without asking. What a Ninjask!