I was wondering if you can help me
what is the word when you use unessecary words e.g reverse backwards
what is the "posh" word for exaggeration
It's called pleonasm, or redundancy.
Overstatement, magnification, hyperbole - you can't really give them quality of being posh.
But, maybe overlashing... :D
Dunno, really... What's wrong with 'exaggeration'?