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2.
a frozen rocky mountain oyster on a stick (as mentioned on EPISODE S1E1 Space Pilot 3000 of Futurama)
Guy: They're tasty, right? Let's call 'em "Tasty-cles"

Girl: We can't call them that.

Guy: Why not?

Girl: It sounds too much like those frozen rocky mountain oysters on a stick. You know, testcicles!
by teh_joe October 13, 2012
 
1.
A male's testicles, when exposed to extreme cold and are useless for anything other than identifying a male as male (if even that).
Man, it's so cold outside, my testicles are turning into test-cicles...
by Shadowulf1 January 25, 2011