A person who gets large, colorful tattoos simply because it it is the current fad. A tat tool has no appreciation for the art or history of tattoos.
Hey, look at this badass coy fish surrounded by roses and skulls and dragons and naked bitches I got on my chest!
You are such a tat tool.
(n)equipment and instruments used by tattoo artists to create tattoos
"Big Tony definitely has the largest tattool collection I have seen. His tattools allow him to meet the requests of all types of ink freaks."
Person with a lot of tattoos.
All the chicks on LA Ink are tattools.
Tattoos on a gentleman or lady that would insinuate that they are a tool. The best identifier is a tattoo of barbed wire, the persons last name, a heart, unicorn/dragon, or trampstamp.
DAMN BRO THAT GUYS GOT SOME SERIOUS TATTOOLS!