noun

• (figuratively) Unimportant or insubstantial talk, events, or actions; drivel.
  "Thousands of African children die each day: why do the newspapers continue to discuss unnecessary showbiz froth?"
• (business) Highly speculative investment.
  "Efforts of this kind, spurred on to fever heat by tax incentives can only generate inflationary froth - not real hard investment."

verb

• (transitive) To create froth in (a liquid).
  "I like to froth my coffee for ten seconds exactly."
• (intransitive) (of a liquid) To bubble.
  "Colder and louder blew the wind, A gale from the Northeast, The snow fell hissing in the brine, And the billows frothed like yeast."
• (transitive) To spit, vent, or eject, as froth.
  "The Mufti reddens; mark that holy cheek. He frets within, froths treason at his mouth, And churns it thro’ his teeth […]"
• (intransitive) (literally) To spew saliva as froth; (figuratively) to rage, vent one's anger.
  "The clumsy suckling struck out with her still soft claws, opened her frothing mouth until her milk teeth shone."