usually used instead of calling someone retarded, gay, or a dickwipe. you call someone this when they're acting immature and like a little peice of ass waste. not the best comeback, but when you call someone this, they'll be blown away and look up assmulch on urban dictionary because they'll be frazzled until they find out why they've been called something so haneous.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

Ass mulch is a sticky brown substance excreted from the anus. Once excreted it is placed outside in direct sunlight to cake in the heat. The resulting odor can be smelled from a distance of over ten metres and anyone within that radius when the ass mulch is 'Fully caked' will suffer from death. The texture after cooking willm be crispy and crusty like batter on a fish but shit. It can be consumed, but if you want to feel like someone shoved gravel down you throat while dumping in you mouth, be my guest, however the taste has been know to resemble compost mixed with raw sewage and bassil.

There is an alternate way of making Ass Mulch, it can be put in a berlap sack (known as a shittysack) and left to 'mature' at the bottem of your local compost heap. The characteristics are relatively similar to the 'caked ass mulch', only it has a distinct after taste of someone pouring liquified ass cookies down the throat.