Any stationary weapon capable of indentifying and assaulting individual targets without the aide of human operators.
"The sentry gun could track up to five targets simultaneously."
by Plagued July 30, 2003

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Top Definition
In TFC, a machinegun on a tripod that shoots on its own. Built by an engineer and avoided/destroyed by a disguised spy
"Somebody take out the sentry gun in the flag room!"
"We need a sentry gun in the flag room!"
by Anonymous June 02, 2003

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt