Pseudo means -like or similar.
The best way to understand this is to break it down.
Hypoparathyroid is an underactive parathyroid gland, so too little parathyroid hormone is released into the blood - this causes low calcium levels in the blood.
Pseudo-hypoparathyroid is like hypoparathyroid but instead of lack of parathyroid hormone causing the low calcium levels, it is resistance to the hormone at the receptor levels - hence it is pseudo- because it is like hypoparathyroid but the parathyroid hormone level is actually normal. It is associated with other abnormalities like short stature and short metacarpals (hand bones).
Pseudo-pseudo-hypoparathyroid has nothing to do with calcium, but it is "-like" pseudohypoparathyroid in terms of bone abnormalities.
Hope that helps.
It's a genetic disorder that closely simulates the symptoms, but not the consequences, of pseudohypoparathyroidism. Therefore, it has zero to mild manifestations of either hypoparathyroidism or tetanic convulsions.