Ok... both Deeper and Johnnyfuckerfaster, were jokes about kids with those names getting busted having sex. Their mom or whoever busted them would be disapprovingly yelling their name at them over and over until they would respond, "I'm fucking her as fast as I can". I know, pretty lame.
The other one was stupid too, but funnier. I think it's one traveling salesman ends up staying in this farmers barn. The farmers tells him to make himself at home, "but, whatever you do, don't stick your dick in the 3 holes in the wall". So of course the salesman lays awake tortured by the curiosity of what is on the other side of each of these 3 holes. So he gets up in the middle of the night to find out (and of course I would have done the same thing).
So he sticks his dick in the first hole and it feels good. Then he sticks his dick in the second hole and it feels even better... so of course next he goes for hole number three. He is awakened the next morning by the farmer who tells him that his wife was behind hole number one, his daughter was behind hole number two, and a milking machine set on high was behind whole number three.
There was a little bit more flare to them as I seem to recall when I heard them on the playground as a kid, but you get the gist of the jokes. If you ever manage to catch the Mr. Show version of the 3 holes joke, you will be rolling!