Top Definition
When you have an object with a point, such as the corner of a textbook, in your backpack, or something that reaches to your butt and stays there poking your butt.
1.My textbook in my backpack keeps buttspiking me.2.My textbook is being a buttspike.3.Something keeps buttspiking me!
by GRIMROCKER777 December 10, 2010

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