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1.
SOOSE is the acronym for "Sudden Onset Of Shit Episode," whereupon one is overcome by the sudden NEED to shit. This necessitates the urgent, often frantic, need to find a toilet, ASAP, or risk uncontrolled evacuation of one's bowels in whatever one is wearing at that moment. Often accompanied by growling of the lower bowels, and diarrhea.
Roger had a SOOSE, but made it to a toilet in time.
by Whistle Berries July 20, 2011
 
2.
A slang term used to describe a "dirty girl".

A shortened version of the spanish word 'sucia' pronounced sue-see-ah
Gina is a soose, she sleeps with a different guy every night of the week.
by Beckarinaxx August 24, 2009