You are correct. This is George Carlin's 'Seven words you cannot say on television. This was the crux of a major 1st amendment case case click here
for some background.
I didn't know of the 'tent flap' bit, but a little searhing seems to attribute this to a Mitch Hedberg.
"It's 106 miles to Chicago. We've got a full tank of gas, half a packet of cigarettes, it's dark, and we're wearing sunglasses... Hit it."