Top Definition
Derived from bible thumper

An automobile that:

* Is valued at less than $1000.00

* Is covered with more than a dozen bumper stickers preaching an ideal you disagree with

* Travels at half the speed limit and tends to linger between lanes
"I'll be late for work unless this fucking bumper thumper gets out of my way."
by AbnormalBoy April 23, 2004
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