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1.
Common word for a recycling heap in the backyard. Also used to describe a girl who is similar to a smelly, large pile of rotting and decaying waste.
See that fatty, she is so unwanted she is compost.
by Reece Evans March 09, 2008
 
2.
the act of not removing the ash out of a bowl of a bong or pipe. To throw in more smoking material (tobaco marijuana) on top of the ash and continue smoking.
"Don't bother ashing bro, compost that shyt "-willy potsmoker
by smalliebigs September 16, 2009