In which country do u call a bus a guagua argentina spain cuba colombia

You would call a bus a guagua in C. Cuba.

In Spanish, the word guagua means a bucket, however, in colloquial everyday speech, the Cubans also refer a bus as a guagua. The word is not that new, actually, as it has been used with this meaning since the 19th century in Cuba

we could tell by the rotten smell, that something putrid was in our trash can.