빨다 has two everyday meanings and both turn up here. It is laundering: 티셔츠는 무조건 한 번 입고 빨아야 돼요, 'a T-shirt has to be washed after a single wearing'. It is also sucking, and in the set pair 물고 빨다 — bite and suck — it means smothering someone with affection, said of grandparents and babies: 그때는 매일 물고 빨고 너무 귀엽고 사랑스러웠는데. Only what is being washed or kissed tells you which.