moop

To keep company, closely associate with.

Acronym of matter out of place; litter.

These fences catch any MOOP (“matter out of place”) that blows out of peoples' camps, where it can be harvested and packed out—leave no trace—and all that.

After days of rain and mud, blocked exits and postponed parties, the last of Burning Man’s crowds trudged out of the Nevada desert on Wednesday morning. The “moop” remained. That is Burning Man argot for rubbish, short for “matter out of place”: a galaxy of jetsam scattered across the muddy alkali flats, after torrential rains temporarily stranded tens of thousands of people at the annual revelry of art and music.