To steal, pillage, pilfer, or plunder poorly guarded items when nobody is looking.
Often done under cover of darkness when such a commodity is absolutely critical to one's cause, or there simply isn't anything better to do.
When I ran out of gas, I thought I was going to have to push my car five miles to the next gas station. Fortunately, I was able to rebel raid a gas can from a nearby shed to save the day.
If you're tired of those fat people skinny dipping in the lake next to your house, just rebel raid all their shit and then we'll see if they come back.