slum

A heavily populated urban area characterized by substandard housing and squalor.

To visit impoverished areas or squalid locales, especially out of curiosity or for amusement.

(slum it) To endure conditions or accommodations that are worse than what one is accustomed to.

In metallurgy, same as slime, 3: chiefly in the plural.

A dirty back street of a city, especially such a street inhabited by a squalid and criminal population; a low and dangerous neighborhood: chiefly in the plural.