What does pearl necklace mean in ZZ Top song?

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Tags

1. #person
2. #resembles
3. #which
4. #woman
5. #slang
6. #originates
7. #breasts
8. #ejaculates
9. #semen
10. #generally
11. #pearls
12. #translucent
13. #white
14. #chest
15. #deposited
16. #necklace
17. #another
18. #pearl