littering

To drop or throw trash without properly disposing of it (as discarding in public areas rather than trash receptacles).

“By tossing the bottle out the window, he was littering.”

To scatter carelessly about.

To strew (a place) with scattered articles.

To give birth to, used of animals.

To produce a litter of young.

To supply (cattle etc.) with litter; to cover with litter, as the floor of a stall.

To be supplied with litter as bedding; to sleep or make one's bed in litter.

The dropping of litter.