Tats are ok if they mean something to you, and are something that either A) you can explain or b) people "get" without the explanation. If you have one that everyone looks at and says "huh?" even after you explain what it means, then its stupid.
Personally I'm getting sick of every high school or college aged female in the US getting those stupid "butt hat" tattoos. They were stupid when the trend first started, and they're even dumber now. And I'm sure they're gonna be sexy as hell in 60 years.