Contrary to these other terrible definitions, it literally just means "and other, similar things." Or "whatever else."

Very common and simple to understand.

used to not give the names of everything

The details you forget to name, when naming other specifics.

The condition of not knowing what the fuck is going on.

Commonly used by people with low IQ and who use double negatives in a sentence. A Whatnot will have few teeth that aren't rotting out of their head and usually are conservative politically.

The moron's punctuation. Most frequently used by morons to end a sentence.

Commonly used by people with low IQ who use multiple double negatives when they speak. A Whatnot will have very few teeth that aren’t rotting out of their head and are usually conservative politically.