Is that why the SEX PISTOLS sang:

"We're so pretty, oh so pretty VAAY - CANT"

i get it now - VACANT is the opposite to ENGAGED upon the door of a public toilet.

VAY means EGGS in slavic languages.

CANT means 'rubbish' in old-fashioned vernacular as in "that's just cant"...E M FORSTER's characters often use it...in MAURICE for example, a common phrase used at OXBRIDGE of the period...