up himself 

Aussie Slang term describing somebody who thinks much higher of themselves than others do and makes sure to let everyone else know why he believes he is superior.

That JohnnyQuinella guy thinks he is gods gift to everyone, he is so up himself. I think everyone is tired of him talking himself up so much

up himself by LayinYaMama August 16, 2016

up himself 

Or herself. Full of his own importance; self-absorbed; conceited; precious about his talents or significance.

British slang.

Stephen Fry: revered by some, considered pretty much entirely up himself by others.

up himself by Ruffcutt March 8, 2012

all up on himself 

Selfish; to not be compared to anyone else

He is all up on himself.

all up on himself by -farmer62 September 23, 2016