An asstoo is a tattoo that someone gets on their rear end. It is much like a tramp stamp but on the ass.
"That girl just bent over and I saw her asstoo, it was a tattoo of a butt crack."
An asstoo is when you get your ass or hips tatooed. Girls do this more then guys.
Did you see her butterfly asstoo its hot.
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When you get drunk and get a tatoo on your ass.
Hey Wes, you got to sit down for this. We got drunk at the rugby game and ended up getting asstoo's.
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The tattoo that girls get above their ass crack.
"Did you that girls asstoo?"
"No"
"Man it said "bootylicious", unreal. She let me take a pic of it!