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.

A pick me is a woman that is willing to do anything for male approval. She will embarrass or throw other women under the bus to achieve this goal. The unfortunate thing about a pick me is usually the men they are trying to seek approval from are of poor quality and treat women badly, leaving little real benefit for the pick me.

A term that the person Anonymous #88,001 obviously has no clue about.

The term originally appeared in August 2010 on the amirite.net chat room when one user told a BS story that got everyone enraged and then blamed her actions on her made up sister "Tia".

Unfunny forced meme originated by an amirite.net user naming themselves "Tia" who hacked a post of the website making it have 100,000,000+ "Yes You Are"s (which would be similar to a Facebook like). Amirite.net mods and admins in the comments of the post tried to make this a forced unfunny meme.