They may can do it Friday, or they may wait til Monday.

source: 
DiPaolo
Entry: 
1387
Example: 
They may can do it Friday, or they may wait till Monday.
Modal 1: 
may
Modal 2: 
can
Gender: 
Male
Race/Ethnicity: 
White
Age: 
40s
Level of Education: 
Unknown
Home Community, Town, or State: 
TX (Beaumont)
Location Collected: 
TX (Austin)
Year: 
1979
Relation to Addressee: 
man to woman
Medium: 
Spoken
Sentence Structure: 
1.1
Status: 
Naturalistic