“Puffing a car” usually means leaving your car running while it’s parked and unattended so it can warm up, especially in cold weather.

Quick Scoop: Meaning

  • It refers to starting the engine, then going back inside while the vehicle idles in the driveway or street.
  • The name comes from the visible “puffs” of exhaust or steam from the tailpipe in cold air.
  • Thieves look for “puffing” cars because they’re running, unlocked, and easy to steal.

Is it legal?

  • In several U.S. states (like Texas and Colorado), it’s illegal to leave a running vehicle unattended, and you can be fined.
  • Laws usually require you to stop the engine, remove the key, and lock the ignition if you’re not in the car.

Other uses of “puffing” and cars

  • In sales or car ads, “puffing” can also mean making exaggerated, opinion-based claims about a car (like “this is the best car ever”) that aren’t meant to be taken as precise facts.

TL;DR: When people talk about “puffing a car,” they’re typically talking about leaving it running, unattended, and warming up in cold weather—a risky habit that’s even illegal in some places.