Green’s Dictionary of Slang

1. (US) a thorn, a burr [it SE sticks to one’s clothes].

1889		H.M. McConnell Five Years a Cavalryman 34–5: The leaves when submitted to the action of fire in order to burn off the sharp stickers, are used as food for cattle [DA].
1899		M. Going Field, Forest and Wayside Flowers 350: When the ‘stickers’ are at last picked or rubbed off, they fall to the ground [DA].
1945		B. Macdonald Egg and I (1946) 94: My hair and shoulders were full of twigs and stickers.

2. (US) a postage stamp.

1904		Number 1500 Life In Sing Sing 253: Stickers. Postage stamps.
1914		Wash. Post 11 Nov. Misc. 3/6: Stamps throughout the underworld are called ‘stickers.’.
1926		J. Black You Can’t Win (2000) 95: You’re a cinch to get a coin and a bundle of stickers out of every ‘P.O.’. You can peddle the stamps anywhere at sixty or eighty per cent.
1933		Ersine Und. and Prison Sl. 71: stickers, n. Postage stamps, usually stolen ones.
1949		Monteleone Criminal Sl. (rev. edn).

3. (S.Afr.) a judge.

1963		L.F. Freed Crime in S. Afr. 106: A ‘sinker’, a ‘sticker’ or a ‘stretcher’ is a judge.
1984		Partridge DSUE (8th edn) 140/2: [...] 1982.

4. (Aus./N.Z.) a traffic ticket, which was orig. stuck to one’s windscreen.

1990		T. Winton Human Torpedo 109: They got a yellow sticker from the traffic cops.
2003		McGill Reed Dict. of N.Z. Sl.