1 a rubbish tip 18-.
2 term of abuse to a person, especially to a woman of supposed loose morals: After I told my parents, they said they were disappointed in me for being a wee midden. [that is, being unmarried and pregnant] 19-. etymology: Scots; Older Scots medynge ‘a dunghill, ante 1400’; attested by JS and BW; sense 1 attested by SR note:
In general Scots sense 2 can also mean a person who has bad personal hygiene as well as loose morals.