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?"
Alvy Singer (Woody Allen) to girlfriend re rock concert:
"Was it heavy? Did it achieve . . . um, heavyosity?"