The American Heritage® Dictionary of the English Language, 4th Edition
verb-intransitive. To act as a freebooter; plunder.
The Century Dictionary and Cyclopedia
To act as a freebooter; plunder.
Word Usage
"A tweak of the financial reform package that takes a strong first step toward reining in the orgy of Wall Street freeboot speculation, trading, swaps, and scams of investors, borrowers and the government that nearly wrecked the economy."