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1.
A heartless, automative beast developed by the Guardian Units of Nations, or G.U.N., military branch. It is commonly found recklessly wreaking ungodly havok upon the sloped streets of San Francisco. It careens through the streets going on a relentless killing spree, destroying millions in public property in the process. It is three-stories-tall, two-lanes-wide, and is capable of making impossible 90 degree turns at inconceivable speeds.

It's sole purpose is to chase down and deflate the world-famous Sonic the Hedgehog, who was wrongly accused of museum theft commited by a similar, but unrelated, hedgehog at the time.

The G.U.N. Truck would eventually crash into an inconvenient bridge and begin it's redevelopment process. After economic woes and an intense room in court, the G.U.N. Federation rebuilt the same truck that got themselves in trouble in the first place with fancy new features like bussaw arms and rockets that allow sideways driving alongside buildings.
Guy 1: "My car! Oh my god, what the HELL happened to my car?!"

Guy 2: "Didn't you hear? G.U.N. Truck came by and thrashed it."

Guy 1: "Why the hell would it do that?"

Guy 2: "It was trying to flatten a woodland creature."

Guy 1:"..."
by Codybean1 October 26, 2011
 
2.
A group of people (usually males) surrounding a person or persons of opposite sex that act as an imposing force. Military reference a gun truck is a heavily armed vehicle that is used to protect important cargo in a convoy.
I would go talk to that fine ass honey but look at those guntrucks surrounding her.
by jimmy schaffer October 21, 2004