what is the meaning of bolo in this context?

Joey

New member
Alexx raised her eyebrows."let me get this straight--you think someone murdered this fish?"
wolf's grin got even wider."that's right.we have got a BOLO out on a guy with a wooden leg.he may be armed with a harpoon."
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got a bolo out on a guy?--what is that supposed to mean?
 
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