No meaning by itself.
Combined with the terms "marco" and "paolo" forms a word which in ancient times up to present is defined as "eternity". Mostly associated with mystery.

noun:
A man that cannot be quantified.

adjective:
Mysterious.

abbreviations:
mpst

the addition and the positioning of
"s" to "mpt" forming "mpst" still remains a mystery.

When you eat dirt for the first time and leave your family to build a shack in the woods