They also (are believed to, based on famous calculations by Hawking) radiate like a black body with a temperature related to their mass. And this leads to them losing mass over time, eventually evaporating. (Leaving what is a subject of much debate.)
I believe the "spew" that booleandilemma was referring to were the twin perpendicular "jets" that black holes often seem to eject, for which the explanation is probably some sort of angular momentum/near miss close to the event horizon sort of thing.
