A fork of Rural Dictionary
Something used not to replace crabs, but to replace school lunches
Get imitation crab now
Copying or plagiarizing.
The poseur said that he/she was going to be his/her quirky, colorful self (a non-existant person except inside your head), but it looks like you were tricked again, since the first thing that he/she did after he/she said that was to start imitating somebody else the same way that he/she had done throughout his/her childhood (an activity he/she thought of as egoless).