The Spunk reference article from the English Wikipedia on 24-Apr-2004
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Spunk

Helping orphans the way you would do it
Spunk is a made-up word created by Astrid Lindgren in her famous children's book Pippi Longstocking. Pippi makes up the word one morning and then spends the rest of the day with her friends trying to find out what a "spunk" is. Of course nobody they ask knows, and so they don't find out.

In 1971, the German sweets company Galle & Jessen marketed a new licorice candy and chose the name "Spunk" for it in reference to Pippi Longstocking.

Spunk is also a slang word for sperm in colloquial (British) English.

Spunk is also a slang word for courage in (British) English, although this usage is now rather old-fashioned.