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1.
When delicious ice cream is melted due to it being unattended turning into a liquid where you consume it like soup.
I forgot and left my bowl of ice cream too long now its all liquidy... It's an ice cream soup!
by MEOWMIXMAN August 21, 2009
 
2.
The act of sitting in a tub of buttermilk and defecating while simultaneously spinning counter-clockwise to create a ribbon effect.
Hey John, I made some peanut style ice cream soup last night!
by Kurgan January 07, 2011