Related Clues:

• Flavor of the month, so to speak
• Online store offering
• Pet rocks or the Macarena, e.g
• Short-lived trend
• Poodle skirt or parachute pants
• The limbo, once
• Angry Birds, e.g., in 2010
• Fruit Ninja, e.g
• Short-lived diet, perhaps
• HBO GO, for one
• Phone download
• It runs its course quickly
• BlackBerry buy
• 80 Down download
• iPad user's purchase