Random

random, adj., randomize, to, v. 1. in general usage, (adj.) relating to, having, or being elements or events with definite probability of occurrence; (v.) to select, assign, or arrange in a way relating to elements or events with definite probability of occurrence; c. 1926. 2. in gamerese, to use a die roll to determine success or failure; or determine the outcome of an event.
Ex: "So, are we gonna make it through the Old Forest without any encounters? I need E.P." "Okay, let me randomize some wandering monsters." [GJ1]
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Addendum: Some gamers ain't so bright when it comes to randomizing with dice. They don't seem to realize that there's a significant difference between, say, rolling 2d10s versus 1d20; or that 3d6 won't produce "8" as often as "10." It's all about the math, folks. [GJ1]