Abbreviated form of, "I eat ass"
Nothing more, nothing less

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.

most bullshit condensed into one class

IEA stands for Insanely Ever After, a very popular tumblr roleplay. It takes princes and princesses (mostly Disney) and gives them each a disorder. It is set in an asylum.

meaning no in Japan