Tattoos mean different things for different people. Most are an expression of a like (hobby, band, person, team), of affiliation (group, military, family) or they're a memorial/tribute. I currently have none but there is one I am going to get that will match one my spouse is getting. She has several tattoos herself. A couple are memorials to people who were important in her life who have passed on (one is a tribute to her grandparents and one to her father), others are simply representations of things that she likes. Most of her side of the family is similarly tattooed.
One of my brothers has tattoos representing his favorite sports teams. My other brother has tattoos representing heavy metal bands he likes and the band he was in for some time. My grandfathers both had military tattoos.
I have no problem with most tattoos nor with heavily tattooed individuals except where those tattoos represent their gang affiliation or show hatred toward others (i.e., Neo-Nazi tattoos). I never got one myself because I have an incredible fear of needles. I'm going to brave the tattoo gun one time to get the one my spouse and I both want. I'll just continue to admire everyone else's body art!