Ditzo noun
A forgetful person; a fool
I am such a ditzo because I often forget my key.
What a ditzo! She forgot her wallet again.
He is a ditzo. He cannot tell duck eggs from chicken eggs.
If you say someone goes in one ear and out the other, you mean they don't pay attention to and forget about what you have just said immediately.
(n): a fool person,
(adj): stupid, foolish, silly
A blustering idiot
Not intelligent, dumb or foolish
This word took its root from the adjective "ditzy", which was first recorded in 1973.
A remark you make when you are leaving on the purpose of creating a stronger impact
The letter he left before leaving was his parting shot.