You cant go around asking people to show you their Tatts, at least take them out for a meal, get to know them, you know, be a proper Gent. The rules are containted in QR's, rule of thumb, they should not be raciest, Un PC etc and preferably out of sight when in Uniform.
get some tears coming out of your left eye and "what the feck are you looking at ?" tatted across your head. Spiders web on the elbows and neck also rock. If you can't afford them then just go for the obligatory dotted line around the throat and the words "Cut Hear". If you are feeling flush then get a little red triangle with your blood group and zap number tatted onto your forearms (don't see too many of them these days).