An emo person with no feelings inside and someone who can hide their emotions very well
The girl was an atto because of the way people judges her
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Lazy name for a furry that has chosen an otter for his/her "sona".
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The Atto Treatment, also know as "AT," is a treatment that everyone jumps a certain person. This was first created when someone named "Atto" was getting jumped by 12 people at once.
"Give that man the atto treatment!"