A small and limited period of time where one engages in as much sexual contact with as many partners as possible.
by adamnmn86 May 13, 2010

Female: It's time for the infamous countdown... I'll countdown from 20 and on 0, you cum right in my mouth.
Ron: On 0, right in the mouth.
Ron: On 0, right in the mouth.
by Scripple021 May 6, 2004

by I LOVE TOASTERS July 8, 2010

An attractive female who studies maths or has a degree in it.
However it can generally be used to describe any attractive and intelligent girl.
However it can generally be used to describe any attractive and intelligent girl.
by shitsplatter September 21, 2013

When you're feeling extremely happy (or occasionally awfully sad) that you can't wait til getting home to upload your facebook status, thus ignoring your family at all.
YOU: I can't believe it!I passed the exam!I graduated!!
FRIEND: oh,congrats dude! go home,your family must be anxious and wanting to hug you and celebrate!
YOU:no way man! I'm on the facebook countdown,,all I want is to upload my status.. My family will have time to celebrate then.
FRIEND: you freak!
FRIEND: oh,congrats dude! go home,your family must be anxious and wanting to hug you and celebrate!
YOU:no way man! I'm on the facebook countdown,,all I want is to upload my status.. My family will have time to celebrate then.
FRIEND: you freak!
by Nachoo December 19, 2009

Nickname of San Antonio, Texas because of its area code number is 210. Orlando, Florida also has claim to the name because its area code is 321
by Alfred O. August 7, 2007

Purposely eating one or more servings of corn to time and count your digestive process. The countdown from consumption to evacuation and spotting said corn in one’s shit.
I’ve been having some bowel issues lately. My doctor recommended a corn countdown before ordering any tests.
by Eaton Holgoode April 3, 2018
