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1.
Basically, a chair ususually used by
a geek, nerd, or gamer designed for
sitting long durations in front of a computer.

The "fart" comes in because typically
the padding in the chair retains the
residual flatulence which is outputted
into the chair over a long period of time by the owner.

Often times an IFC will also have holes
or other defects in it, sometimes an
arm missing, torn/holes in fabric, etc, but despite all the damage and/or smell,
the user will typically keep an IFC around until the chair starts to
deteriorate to the point of being
unuseable.

Cloth-padded chairs tend to fit the IFC
profile more perfectly since leather tends to make the fart smell "bounce off" the chair instead of getting trapped inside the padding. A true
internet fart chair may even retain the
fart smell for years.
"James finally retired his beloved
Internet Fart Chair after months of
evercrack caused the arms of the
chair to loosen and break off. "
by Dr. Grant May 31, 2005