Salty-dog definitions

(US, Navy, Marines) An experienced sailor.
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A sexually promiscuous man; a male sexual partner.
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A cocktail consisting of vodka, grapefruit juice, and a salt rim.
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Origin of salty-dog

Sexual sense may be due to association of sailors with sexual promiscuity, or may be separate development, salty (“spicy”) and dog both suggesting promiscuity.