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1.
When something is lame, not cool, or undesirable.
Josh: Did you see that movie last night?
Ariel: Yeah, it was cold potatoes.
Josh: What..?
Ariel: You heard me. Urbandictionary that shit, man.
by plovestrees October 29, 2009
 
2.
when a kidneystone comes out with your cum
I felt so much better after passing on my cold potato
by cowbell42 December 03, 2010