I guess I might could do it.

source: 
Mishoe
Entry: 
34
Example: 
I guess I might could do it.
Modal 1: 
might
Modal 2: 
could
Gender: 
Male
Race/Ethnicity: 
White
Age: 
18
Level of Education: 
College (Freshman)
Home Community, Town, or State: 
Unknown
Location Collected: 
SC/ NC (Unknown)
Year: 
c1990
Relation to Addressee: 
student to instructor
Medium: 
Spoken
Sentence Structure: 
1.4
Status: 
Naturalistic