Okay, here's what you do. You get this Alvin tattoo, and when a squirrel you're trying to impress scampers by, you yell out, "Hey! Squirrel! Check it out!" and then you proceed to spit on your own tattoo. The squirrel will love it. Squirrels HATE chipmunks.
Same goes for Chip and Dale. Although, if you REALLY want to impress the squirrel, take a knife and skin off your tattoo. It will cost you pain, money and a lot of blood, but it will be worth it when you see the admiration in their little squirrel eyes.