heavyosity 

A fake but funny-sounding attempt to use heavy as a noun ("heaviness" would be standard.)

From 1977 Academy Award winning film ANNIE HALL, screenplay Woody Allen and Marshall Brickman:

Alvy Singer (Woody Allen) to girlfriend re rock concert:

"Was it heavy? Did it achieve . . . um, heavyosity?"

heavyosity by al-in-chgo March 8, 2010

heaviosity 

Of or possessing an aura of deepness maximus.

Heaviosity. Maximum heaviosity. The heaviest heaviosity.

heaviosity by Lou Abraham December 14, 2007