Seamount 

The act of a woman mounting a man and riding him in an oceanic fashion

Daves mom seamounted Ryan

Seamount by Daves Moms December 10, 2010

semount 

A gay man who spends all his time on line or playing video games. 9 out of ten times will have a cat.

That guy never gets out, he's such a semount

semount by Count Dooku FN July 7, 2011