Green’s Dictionary of Slang

1. (Aus. prison) an inexperienced or short prison officer.

1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Smurf. A small officer or a new recruit. Links blue coloured cartoon characters of the same name to NSW prison uniform colour.
1999		S. King Hearts in Atlantis (2000) 523: To Jasper the Police-Smurf he is now giving a sermon of silence. People like Officer Wenlock always think the worst.

2. (US gay) a blond young homosexual man.

1998

R. Scott Rebecca’s Dict. of Queer Sl. 🌐 smurf — gay guys under 25, usually blonde with lots of attitude.

3. (Aus.) a term of abuse.

1990

T. Winton Human Torpedo 97: ‘I heard about you, smurf [...] I don’t wanna hear anymore, right?’ Lockie took a punch in the guts.

4. (US drugs, also smurfer) one who buys pseudoephedrine in a pharmacy and then sells it on to a manfucturer of methamphetamine; also as v.

2008		wav3.com 29 Sept. 🌐 Do you know what a Smurf is? It's probably not what you're thinking [...] the word ‘Smurf’ is now used to describe someone who buys pseudoephedrine and hands it over to people cooking meth.
2013		J. Stahl Bad Sex on Speed 65: I experienced an unsurpassed low. I smurfed. That is, I scored pseudoephedrine products at Rite Aid for some Okie skeek who cooked in the trunk of his rusted-out Pontiac.
2013		J. Stahl Bad Sex on Speed 65: Smurfs were the low-lifes who hit every pharmacy, 7-Eleven and grocery store [...] ephedra-hopping, tossing the legally permissable three packets of Sudafed, Actifed, Sinufed [...] into a bag .
2013		J. Stahl Bad Sex on Speed 67: Some smurfers sprayed Windex in their eyes, to make them water, as if in the grips of a major allergy.
2014		M. McBride Swollen Red Sun 78: Smurfing was the latest in illegal trends related to the drug trade. Tweakers would spend all day driving from one gas station to the next buying cold medicine, pseudoephedrine the active ingredient in methamphetamine manufacturing.