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A has been wanna be 

A person who used to want to be someone else but just never fully suceeded.
Oh look at that woman over there she is such a has been wanna be!

haven't been but looking to be

a highly useful expression. it's generally used for people who always talk about sex, drinking, etc. but never do it.
Kerri is a tease who flirts with many guys but never puts out. she hasn't been but she's looking to be.

I wanna go drinking but I'm so worried bout doing something stupid while I'm wasted. Haven't been but looking to be

what has been seen cannot be unseen 

The act of witnessing something so traumatic or disturbing that it is futilely wished to be unseen. Most commonly experienced on 4chan's /b/ or senior citizen dating websites.
See also: eye bleach
Me: Oh hey, look, some Nigerian dude emailed me a file called BlueGoatseWaffles! Maybe its a picture of blue goats doing people stuff...like cooking waffles!
*Click*
*35 seconds later*
Me: What has been seen cannot be unseen.

Attention: If you or a loved one has been diagnosed with mesothelioma you may be entitled to compensation.

I Attention: If you or a loved one has been diagnosed with mesothelioma you may be entitled to compensation. My pants