A sexual term. When a man is given a hand job while not erected and ejaculates in every direction. This is due to his penis flopping around from the hand's jerking motion.. much like an unattended firehose pumping water and flailing about.
Last night, I let Jackie in on what the Unattended Firehose was and skeeted all over her new sheets.
by Helicopter in the shower November 4, 2009