n. 1. The butt. In the same way a gas tank is filled up with gas, the spank tank may be filled up with a good spanking.
2. The mental database of naughty images to which one can spank the monkey when more conventional pornography is not, uh, "at hand."
1. Yo baby, come over here and lemme fill up yer spank tank.
2. My mom threw away all my porno mags. Now I have to rely on my spank tank.
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