look up any word, like ethered:
 
1.
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?"
by al-in-chgo March 07, 2010