A “Misery Chain” describes the "endless cycle" of bad parenting.
"Fucked up parents" create "fucked up kids" who grow up to have more fucked up kids of their own, which keeps the Misery Chain going on and on into the future.
"Misery Chains" are often created by selfish or stupid people with no insight or sense of ethics: playboys, players, skanks, sluts, floozies, druggies, crack heads, dark friends, beach trolls, hill trolls, city trolls and trolls in general.
Wow, she created one “misery chain” having all those “screwed-up” kids by a bunch of different “screwed-up” guys.
Popularized by the movie, "The Heathers", this phrase is said in response to a request one deems impossible or absurd (much like being gently fucked with a chainsaw). It's basically a way of showing someone how ridiculous what they've just asked sounds.
Ex.
Veronica: “Why can’t we talk to other kinds of people?”
Heather Chandler: “Fuck me gently with a chainsaw. Do I look like Mother Theresa?”
Dylan: "HeyNick can I borrow your car once its out of the shop?"
"Fuck me gently with a chainsaw. You crashed it just last week!"