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When the perceived attractiveness of a girl diminishes as she gets closer
Guy 1: "Hey dude look at this chick walking up, she looks pretty cute"

Guy 2: "Yeah she looks to be about an 8..wait maybe a 7...6...5...4...3..2..OH GOD WHAT WAS THAT THING?!"

Guy 1: "Never underestimate the countdown"
by Jonan2012 November 01, 2010
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The Countdown is when you're receiving oral pleasure from a young lady and she stops to ask you not to slime in her mouth. You agree that'll you'll give her a countdown before you do your business, she smiles and carries on. Just before you slime you start The Countdown from 5 and on the count of 3 you let out a blood curdling scream of 'In the moo' and jiz in her mouth while holding onto the back of her head.
I was getting a gammy off of this wee bird last week and I gave her The Countdown, she wasn't impressed.
by murdo83 June 21, 2007
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