Related Clues:

• Streaking, once
• Quickly spread cultural idea
• "In" thing, for now
• First-grader's attention-getting phrase
• Temporary thing
• It's not hot for long
• '... plus c'est la -- chose'
• It goes in one era and out the other?
• Cultural equivalent of a gene
• Volunteer's cry
• In thing, for now
• Beanie Babies, once
• "Who wants ice cream?" response
• Troll dolls or Silly Bandz
• Internet ___ (viral phenomenon)