Used as a generic blaming tool. When asked who performed the action in question, you blame it on Tia.
It can be used when you don't know who to blame
or when you don't want to confess.
This phrase was first made popular in the amirite
.net community in August 2010.
Tia was a fake persona created by a member of the website to be used as a scapegoat
, but she was soon being passed the blame for other incidents by other members too.