What is bump stock?

When silly bitches turn the bass up all the way on their stock speakers, in their cars, and it sounds terrible.

dude, don't be lame. buy some 20's or something, don't bump the stock

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bump stock - video

Bump stock - what is it?

When the D is deep in the V, she's getting the bump stock

Her legs were quivering as I railed her with the bump stock.

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