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1.
To add money to the account of a Boost Mobile phone.
I'm out of miniss so I needs to reboost.

I just reboosted and now I done went and done gone been done went and plum been up out them miniss.
by foxmajik June 28, 2007
 
2.
Slang for 'reboot'. See also boost. To restart your personal computer or other device.
Man I hate these upgrades, they always want me to reboost at the end.
by moogie January 02, 2005