You may should go to the dentist if it's really bothering you a lot.

source: 
Mishoe
Entry: 
102
Example: 
You may should go to the dentist if it's really bothering you a lot.
Modal 1: 
may
Modal 2: 
should
Gender: 
Male
Race/Ethnicity: 
White
Age: 
50s
Level of Education: 
Unknown
Home Community, Town, or State: 
Unknown
Location Collected: 
NC (Asheboro)
Year: 
c1990
Relation to Addressee: 
husband to wife
Medium: 
Spoken
Sentence Structure: 
1.3
Status: 
Naturalistic