1. spirit, mettle, pluck, courage (Slang); kindling, touchwood, wood that catches easily on fire and is used to start a larger fire; (British offensive slang) semen. spunkspunk (spŭ&nsm;k), n. [gael. spong, or ir. sponc, tinder, sponge; cf. as. sponge a sponge (l. spongia), spōn a chip. cf. sponge, punk.] [written also sponk.]