As given by the tags:
The letters are acronyms. And they appear to be famous sayings.
Partial Answers:
MDGOT
YHTSMTMM
You Have To See Me To ??
APSIAPE
A Penny Saved Is A Penny Earned
YGWYPF
You Get What You Pay For
YGAPMAFAYFHFADYTHTFAYGHAOTWFHFAL