ab crack

(Noun)
Derived from 'abdomen crack'
(1) The appearance of a vertical line - a crack - in the middle of the stomach.
(2) An untenable and unhealthy beauty ideal for young, skinny women.

"Ab crack is the new thigh gap."

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The AB Crack-rail

When you take a crack hit and a hot rail and hold them both in together until you get an AB bell ringer.

Did you see Angie take that hot rail? Yeah! Did you see BJ take that crack-hit? Yeah! Did you see them both take that hot-rail and that crack-hit at the same time? Yeah! That's the AB bell ringer aka the AB crack-rail.