- 1. The uncontrolled overheating of a nuclear reactor which causes the core to melt downwards through the bottom of its container, releasing radiation and other bad stuff (see radioactive).
2. When all pretense of control over a situation ends.
3. A rapid drop in the polls.
4. An electoral disaster; a wipeout.
5. Talk radio term for a host who goes off on an angry (and often brutally honest) tangent.
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