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OATT is someone who fakes being sick so they can sleep in, eat donuts, or watch cat videos all day. You're furious because you're stuck doing their job, and you hope they get hit by a bus.
'I called in sick again because my gerbil died. My gerbil died in the middle of the night.'
'I'm not coming in today because my toe is sore. My toe is sore from sitting in a chair.'
'I have the plague. I have the plague from my neighbor's dog.'