Questionable. A little knowledge of the female anatomy would tell you that the cable's not actually anywhere where it would do anything. And frottage is rubbing, and the cable isn't moving. Nothing's showing. I wouldn't want this to be on the screen at work, but this is very clearly not explicit.
If Kenny didn't keep getting killed, the punch line fail would be complete. As it is, it comes close. The correct answer is Butters. Or should I say ... Marjorine?