swing a dead cat
Silly way of relating the quantity or frequency of something in terms of whether you would hit one if you swung a dead cat.
You can't swing a dead cat in that school without hitting some guy with his underwear showing.
Swing a dead cat
A phrase used to describe when there are a lot of something in a small area and that running into them is unavoidable. Seems to be popular with people from the burrows of Philadelphia.
"there are so many coffee joints here that you cant swing a dead cat without hitting one."
Can't swing a dead cat.
When you live in such a small town that you run into someone you know EVERY time you go out. Short for "you can't swing a dead cat by the tail without hitting 2 people you know." Basically means you live in too small a town. In gestured form is done by a circling of one hand in the air like a lassoing action.
I went out to eat with my friends and the waitress comes over and says, "hay, I went to high school with you." My friend says, "you can't swing a dead cat."