/ spʌŋk; NAmE / noun
1.
[ U ] ( informal ) courage; determination
2.
[ U ] ( BrE , taboo , slang ) = semen
3.
[ C ] ( informal , AustralE , informal ) a sexually attractive person
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WORD ORIGIN
mid 16th cent. (in the sense a spark, vestige ): of unknown origin; perhaps a blend of spark and obsolete funk spark .