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"On my 14 carats" is an expression used to indicate when a female is ovulating (most fertile and likely to conceive), which most commonly and predictably occurs on the 14th day of the 28-day menstrual cycle. The expression can be used either in flirtatious seduction or as a warning that birth control should be considered to prevent pregnancy. The expression went viral when Selena Gomez used the expression "I'm on my 14 carats. . ." in the very first line of her seductive song "Good for You," the video for which clearly shows her writhing in the throngs of umcontollable ovulation.
I'm so wet and horny for you right now; I think I'm on my 14 carats.

You better use a condom, because I'm on my 14 carats right now, and I really don't want another baby.
by Stanimal November 06, 2015
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