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When rings are manufactured they are not perfectly flat or square on the insides. When you mount them to your gun, one edge of the ring will make contact with the scope more than the other edge. When you tighten the rings, it can shift the scope ever so slightly and cause inconsistencies in your shot.
Lapping is taking a round bar of your ring diameter that is essentially a large shapening stone. Your rings tightened down and in place, you run the bar back and forth over the bottoms with some lapping compound to make them nice and even. You will usually notice that one edge begins to lose its finish faster than the other. Once they are lapped you set the scope in, place the ring tops on, and tighten it down.
When I had an F-class rifle and was shooting to 1000 yards, the guy who mounted it for me said I needn't bother with lapping as it wasn't really necessary (and considering he manufactures the Timberwolf SWS, I trust his advice). For an airsoft rifle it would be infinitely useless. Don't bother.
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