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When you're pumping gas and stop at the desired amount with out any extra squeezes.
When you're pumping gas at full speed and you only have a 20 spot (or any amount you can afford) and you release the handle at the exact amount without any extra squeezes.

You have just achieved The Perfect Pump.
by CBU (See-boo)/ Chili July 29, 2008
12 3
the perfect shoe. a sexy pair of heels with a low to medium heel.
i was shopping at my favorite store yesterday and found the perfect pump.
by stickynikki March 29, 2010
2 1