Welcome to the board. Interesting query – this limey had never encountered the word before today, so I’ll wait with interest for more enlightened brethren and sistren’s pearls of wisdung (especially the hordes of New Zealander in the light of the second lookup I saw):

Promote by speaking in public
"Up and comers vying for their own taste of limelight will also spruik their talents along Peel Street"

http://www.wordwebonline.com/en/SPRUIK

spruik
verb
(Austral & NZ)
spruiked, spruiking
1. slang
Said especially of showmen, salesmen, etc: to speak in public, especially at length and using ornate language.
Derivative: spruiker
Noun

http://www.allwords.com/word-spruik.html