-they suck
The word chupan is the present form of chupar in the third person plural.
See the full chupar conjugation


Solo tienes un problema si chupan los asientos.
You only have a problem if they lick the seats.
¿Se dan cuenta, es 1999, y algunas mujeres todavía no la chupan?
Do you realize, it is 1999, some women still don't give head?
Los ftalatos sirven para ablandar los juguetes de PVC para los niños, pero se desprenden, sobre todo si los juguetes se chupan, que es lo que, naturalmente, hacen los niños pequeños.
Phthalates are intended to soften PVC toys, but the substances leach out, certainly if the toys are chewed, as they in fact are by small children, of course.
De los pocos que aún chupan tanta gasolina.
One of the few gas guzzlers left.
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