Smut

Smut
smut     /smʌt/  noun.

1.	a particle of soot; sooty matter.

2.	indecent language or publications; obscenity.

3.	a disease of plants, esp. cereal grasses, characterized by the conversion of affected parts into black, powdery masses of spores, caused by fungi of the order Ustilaginales.

- from Dictionary.com

In this context, smut is not a particle of soot or a disease of plants, but rather indecent, obscene badfic that ranges from strong implications of pornography to full-on, no-holds-barred, take-no-prisoners, oh-god-my-eyes-they-burn pornography. There is a wide range of smut on the badfic market, so to speak, ranging from the standard human intercourse, be it boy-on-girl, boy-on-boy or girl-on-girl, to interspecies rape smut (see Celebrían), gay pedophile smut (see To The Moon), and dinosaur smut (see Land Before Time: Littlefoot x Cera).

No canon, no species, no pairing is safe. There is the occasional good smut, but they are rare and far between. In fact, it should be noted that most of the Legendary Badfic list is made up of bad smut.

Smut is usually tackled by the Department of Bad Slash, and sporkings and MSTings of smut are generally the only ways to recover from perusing pure, unadulterated smut.