Echar cachondina a alguien en una copa

[ROBINDESBOIS]

Como se dice eso en inglés?

[Rusty]

Could this be like "slipping someone" a drug/pill/aphrodisiac?

[Tomisimo]

Como se dice eso en inglés?
¿Nos podrías dar una definición o descripción de qué es?

If Rusty is on the right track, another phrase would be to doctor someone's drink.

[poli]

Rusty is definitely on the right track here. I verified this with a reliable
source. It's slipping someone a micky. (commonly the date rape drug)

[ROBINDESBOIS]

Yes cachondina, is a substance that makes you feel very sex-yearning ( I don´t know if this word is right)?

[poli]

Yes cachondina, is a substance that makes you feel very sex-yearning ( I don´t know if this word is right)?
Supongo que puedes usar eso, pero más común es :
a substance that raises libido. o an aphrodisiac