noun. A general derogatory appellation for an adult female. This is current women’s prison slang used in Kansas, Missouri, and probably elsewhere. Slitch is a portmanteau (blend of two words; I don’t really like using "portmanteau", but I didn’t want anyone to suspect I didn’t know it, so I had to use it; “Blend” is simpler) of the two words slut
A slitch can be a snitch
and visa-versa, but the two words are different.
As with many derogatory words, the term slitch can also be used contrarily in a familiar fashion, as in “I love you, my little slitch”.
That heartless slitch doesn't care about anyone but herself.