In any sort of Real Time Strategy or Role Play Game, to go out and attack neutral units for gold and experience, as an alternative to attacking opposing players early on.
Blue: No, let's creep. I want my Hero at least level 3 before we take them on.
Chad: Cool. Hold on one sec. Let me grab my creeps from my room.
Famously known for praying on drunk females too inebriated to judge the general attractiveness of such members.
Members greet each other by raising one leg and making a ''C'' symbol with one hand, whilst exclaiming ''CREEP!''