I've seen those scenes and others edited out on syndicated airings (i.e. WGN). And they definitely edit out some of the worse stuff on Comedy Central when they air earlier in the day. One example I remember is I was watching the Professor Chaos episone at 5 PM, and they cut out the part where Cartman said he sucked the "seamen" out of a hose. But all that good stuff is still in the nighttime airings.
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Booyah, Grandma. Booyah.