Musk was asked whether SpaceX can increase the Falcon Heavy’s performance over time, much like it has with the Falcon 9. That’s when the CEO suggested the possibility of a Falcon Super Heavy — a Falcon Heavy with extra boosters. “We could really dial it up to as much performance as anyone could ever want. If we wanted to we could actually add two more side boosters and make it Falcon Super Heavy,” Musk said. This five-rocket Falcon Super Heavy would have around 9 million pounds of thrust, Musk said, nearly doubling the rocket’s current capability, and putting it in line with the Saturn V as the most powerful rocket ever built.
Elon Musk is a starry-eyed optimist and he talks a good game, but typically backs it up with actual development. But FSH is more along the lines of this concept
We strapped 2 rockets onto another one, why not 5?
What's different about this, vs bfr, is that BFR has some actual development behind it (they've at least built a tank). Maybe FSH will become a thing, but there's only Musk's one quote about it and it's far from the only project being talked up without any actual development (see mars-one, which appears to be a Mars-mission PR firm).
How much speculation do we tolerate in creating new tags?