1. noun, slang A money launderer. When I worked as a smurf for a drug cartel a few years ago, I used to spend all my time traveling across the country to make deposits small enough not to get the feds' attention.

2. noun, slang In competitive online video games, an experienced player who poses as an inexperienced one in order to gain an advantage over other players. This guy's profile says he's only level 4, but he's been getting more kills than all of us combined. I have a feeling we've got a smurf in the game.

3. noun, slang Someone who visits various stores and pharmacies to buy enough pseudoephedrine to synthesize methamphetamine, especially on behalf of someone else. The meth cook hires a bunch of different people to act as his smurfs, all of them rotating around the stores in the city so as not to arouse any suspicions.

4. verb, slang To launder money. A: "My boss has me take the money and deposit it into ATMs around the city. He says it's to reduce the fees we pay." B: "You've been smurfing for your boss? That's money laundering, dude!"

5. verb, slang In competitive online video games, for an experienced player to pretend to be an inexperienced player in order to gain an advantage over other players. Turns out that the dude banned for smurfing had 10 different accounts he'd been using to harass noobs.

6. verb, slang To visit various stores or pharmacies in an area to buy enough pseudoephedrine to synthesize methamphetamine, especially on behalf of someone else. The suspect was caught smurfing in a CVS on Tuesday. He had nearly 200 boxes of cough medicine in his trunk, which he told police were for a friend of his.