What is the meaning of -ish?

Typical of, similar to, being like.

Somewhat, rather.

About, approximately.

Of, belonging, or relating to (a nationality, place, language or similar association with something).

An ending found on some verbs; see usage notes.

-ish (language)

-self

Alternative form of -yssh

A suffix denoting the pejorative form of a noun that ends in a consonant.

pejorative

Used to form slang words (that are often identical in meaning to the unsuffixed word).

Source: wiktionary.org