litter (something or some place) up(redirected from littering up)
litter (something or some place) up
To make something or some place very messy or untidy. I hate the way he litters up his desk with papers and dirty plates—it just looks really unprofessional. The room wasn't clean for more than an hour before the kids had littered it up with toys and bits of food.
litter something up
to mess something up with litter, trash, possessions, etc. Who littered this room up? Who littered up this room?