Green’s Dictionary of Slang

1. a cheerful, happy person.

1924		Minneapolis Star (MN) 17 Dec. 24/3: Sparrow the Spunker charged over the ice after an opponent.
1956		Green bay Press-Gaz. (WI) 10 Jan. 12/7: ‘Spunker’ Strong has more than lived up to his nickname in his six and a half years of life.
1996		Eble Campus Sl. Mar. 7: spunker – someone who is happy, sweet, or enthusiastic. Often used as a noun of address.

2. a general term of abuse, usu. aimed at a male.

1997		N. Barlay Curvy Lovebox 45: You fuckin’ spunkers. Wankaaaahs.
2008		J. Niven Kill Your Friends (2009) 32: How many of these chancing spunkers will be kicking back in their country pile [...] in ten years?

3. a sexually provocative person.

1998		N. Palmer ‘Vegan Reich’ in Home Suspect Device 9: The little spunker had kept him up all night.
1998		A. Warner Sopranos 46: He’s a fucking bonk, a right spunker.
2005		B. Hare Urban Grimshaw 183: Give us a kiss, you little spunker.

4. an affectionate man-to-man term of address.

2000

N. Griffiths Grits 285: Doan worry yaself, cos av got jast the remedy fa that, my son, me old spunka!

5. one who ejaculates.

2000

M. Manning Get Your Cock Out 6: Tara [...] was something of a connoisseur of sperm, able to tell with stunning accuracy what the lucky spunker’s diet had consisted of over the previous two days.