Jack booted is a derogatory term used to describe an overly oppressive and authoritarian individual or group, often denotes violent tendencies. Thugs, thus described, are those in the service of an oppressive authoritarian, usually employing violence to achieve his/her/their master's goals.

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n.

1. Cruelly and violently oppressive brutal ruffians or assassins, usually wearing jackboots.

2. Heavily armed DEA agents, usually dressed in full riot gear, who kick down innocent civilians' doors in search of harmless medicinal herbs.

3. Heavily armed ATF agents, usually dressed in full riot gear, who kick down innocent civilians' doors in search of harmless cuban children.

4. Heavily armed FBI agents, usually dressed in full riot gear, who kick down evil terrorist's doors in search of lethal VX nerve gas.

individuals or groups who are bullies, frequently using violence or the threat thereof to take what they want.