You might did already do that; I don't know.

source: 
Mishoe
Entry: 
83
Example: 
You might did already do that. I don't know.
Modal 1: 
might
Modal 2: 
did
Gender: 
Female
Race/Ethnicity: 
White
Age: 
40s
Level of Education: 
Unknown
Home Community, Town, or State: 
Unknown
Location Collected: 
SC/ NC (Unknown)
Year: 
c1990
Relation to Addressee: 
female to family
Medium: 
Spoken
Sentence Structure: 
1.0
Status: 
Naturalistic