amegomaniac 

a person who is obsessively committed to a friendship with an egotistical or self-centered person.

“My best friend is a complete narcissist so I guess you could say I’m an amegomaniac.”

amegomaniac by SalvyZ June 7, 2019

megomaniac 

People who are full of themselves--who think the world revolves around them.

The pastor of the church thinks everyone is at his beck and call--he's such a megomaniac.

megomaniac by 747Braniff July 11, 2018

aeromaniac 

one who likes puttin the air into things that go boom. (aero-ballistic ay-roe-ball-iss-tik)

Bill shot a potato 75ft. into the air because he is an aeromaniac.

aeromaniac by Scott Wintersworth February 20, 2004