I have two full sleeve tattoos. It's a collection of smaller ones with a main theme on each arm.
That's pretty cool! I'm not a huge fan of tattoos but I can respect good ones.
Yeah, my friends arm is covered in tattoos, but it's not a real sleeve I keep telling him. It's not filled in, and there's a difference!
Oh really? I had no idea that there was such a distinctive difference.
Usually on a full sleeve there's a unified theme. Mine is all of Japanese Anime.
Oh that's cool, I've seen my fair share of anime. Any particular shows that you referenced?
List of Death Note characters
The manga series "Death Note" features an extensive cast of fictional characters designed by Takeshi Obata with their storylines created by Tsugumi Ohba. The story follows the novel of a character named Light Yagami, who uses the notebook he found in order to "cleanse" the world of those humans which he deemed unfit for society. A team of professional investigators set out to find out the mysterious killer and arrest him, and thus many other characters are introduced until Light is eventually caught. 
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Sleeve tattoo
A sleeve tattoo (or tattoo sleeve) is a large tattoo, or a collection of smaller tattoos, that has a unified theme, that covers most or all of a person's arm, usually from shoulder to wrist.
There is a difference between an arm covered in tattoos and a sleeve tattoo. A sleeve tattoo has a unified theme, whereas an arm covered in tattoos may have many tattoos of different styles that does not have an overall unity.
The term "sleeve" is a reference