Oomphadoompha 

extremely ridiculous

that song was oomphadoompha

Oomphadoompha by azile aem March 30, 2009

oomphoompha 

Interchangable with Faafaaluufaa as derogative term for Samoan people. Refers to the sound of Samoan names said quickly.

"Oomphoompha! Or should I say Faafaaluufaa?"

oomphoompha by Gogee March 20, 2005

Oomphaloomph 

A sexual act performed in a bathroom stall between a male and a male or a male and a female. A male is sitting down with his pants down, the other person mounts his erect penis and gyrates on the penis until orgasm.

You've heard of the mile high club, right baby? Have you heard of the sex in the potty club?

Oomphaloomph by 1873X December 15, 2003