Top Definition
The stuff you find at the bottom of your trash can underneath the liner. Usually consists of some kind of old dried sticky spill, maybe a random paper towel and some other gross kitchen related products
I took out the trash the other day and I noticed that the permacrust in the bottom of the trash can looked like it was growing something
by Gretchen0807 July 21, 2009
5 Words related to Permacrust

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