Translation of gruñir

There were no lights on the highway and hardly any cars, but quiet a few motorcycles and funnily pedestrians walking on the emergency lane. There was a tropical atmosphere in the air, I liked it.
We all know that the consequences are awful. All are struggling, some kill eachother, mostly for really foolish reasons. They are not aware of it. Drugs should never be tolerated in any country.
There were heaps of people in this area and we really had to struggle to get through the crowds. We drank a few beers and a couple glasses of wine and being totally tipsy Lili decided she needed to return.