Forgetting how bad bangs look on you and getting them cut again
Robyn: how do you like my new haircut?
Beth: I see you got bangs again...
Robyn: Bangnesia again! Why didn't you stop me? There should be a medical alert bracelet for this!
by Rocking Yellow February 4, 2018
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When you can't remember who you have banged.

When you can't recall how many people you have had sex with.
Wait! I tag teamed you and your brother? I have bangnesia so I don't remember.
by Kaua'i girl May 25, 2017
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the temporary loss of memory as a result of a really passionate sexual encounter
I couldn’t find my keys last night after you gave me bangnesia.
by Paolo Pinta October 4, 2019
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When you’ve banged someone but don’t want to admit it.
I told my wasted mate at 3 AM “ if you go with her, you’re gonna have bangnesia tomorrow”
by Learning Tree January 27, 2022
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