When someone goes Puerto Rico on someone or when someone goes to Puerto Rico during sex, it means that she/he/div. licked the other person's genitals-more specifically the other's person asshole, because the person goes singing "ay ay ay (Puerto Rico)" from the excitement.
-So, how did it go last night?
-She/he/div. went Puerto Rico on me.
Or
She/he/div. went to Puerto Rico on me and I was like "ay ay ay".
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