Definition of geysering:
(n) :
(planetology, geology, volcanology) A boiling natural spring which throws forth jets of water, mud, etc., at frequent intervals, driven upwards by the expansive power of steam.
(n) :
(by extension) A momentary vertical jet or fountain of fluid driven upwards by a violent force.
(n) :
(South Africa, South Asia) A domestic water boiler.
(v) :
(ambitransitive) To (cause to) rush or burst upward like water from a geyser.
(n) :
(British, archaic) An instantaneous, and often dangerous, hot water heater.