Name given to girls with 10/10 asses but you never see their face. Commonly used when you and your buddy are walking behind a fine ass and you casually call out 12:00 to signal your bud.
Matt: Hey Zach, 12:00
Zach: fucking hell twelve o'clock is ahead of us again
Matt: I want to see what she looks like
Zach: That would ruin the magic of a twelve o'clock
by Tyco_ February 28, 2017
A person with no idea how to use any kind of technology. The joke is, all digital clocks, stereos, DVD players, VCRs and so on have their displays flashing 0:00 or 12:00 (twelve o'clock) because the person in question has no idea how to set the time, let alone use any other function offered.
{When standing behind someone at an ATM for a very long time} - What is taking him so long? He must be a twelve o'clock flasher..

I knew i was dealing with a twelve o'clock flasher when she put the CD in data side up.

Can you believe it?! He was trying to use his DVD-ROM to read a floppy! Bloody twelve o'clock flashers!
by Dass Booty October 27, 2003
Girl who is so thin she looks like the hands of a clock at 12:00. Wears size 00 jeans, A cup bra, prefers thongs because they treat her small, but round bottom just right.
Damn! don't want me no Miss 12 O'Clock tonight! Gotta get me some bookshelf --booty!
by Sky April 28, 2005
tech support term
will never be able to fix the problem on the computer
a person who will never and should never be let near a computer.
We've got a twelve o'clock flasher
by Pony Boy September 10, 2003
Putting salt in the nose, taking a drink, and putting lime juice in the eye.
by slang_1 December 28, 2015