Around here phrase "Pencil test" has very specific meaning, nothing to do with breasts
, and even more demeaning
It is a relic from Apartheid in South Africa. Despite the fact that there is no abolute black or white, despite that we are all just shades of pink and brown, the powers-that-were felt the need to draw a line between those that were pink enough to be white and those that were too brown. The test was this - if a pencil, inserted into the hair, would fall out again, you have straight enough hair to be white.
Yes, I know it's stupid. Racist, too. Apartheid was racist by definition. Don't blame me for that.