Can’t Swing A Dead Cat In (Place) Without Hitting A (Thing)

What does the idiom “Can’t Swing A Dead Cat In [Place] Without Hitting A [Thing]” mean?

Definition:

There are many examples of [thing] in this [place].

For example:

“You can’t swing a dead cat in Massachusetts without hitting a good pizzeria.”

Notes:

“Fling a dead cat” is also used.