When poop that is too big and clogs the toilet it's usually because the poop is too large and too big in consistency to pass through the toilet properly.
Sometimes if you're at home you might need to keep a stick nearby to break the big poop up and allow it to flush through the toilet.
Sometimes you might need to flush the toilet 2 or 3 times to get the poop to go through the toilet properly when your poop is too big.
You might also want to install a more expensive powerful toilet if possible and it's happening at home a lot or keep a plunger nearby to plunge the toilet.
The good news is though that having big poop means you have a really healthy colon so it's nothing to worry about other than clogging the toilet.