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The boob/gut test is an at-a-glance way to quickly determine (on a pass/fail basis) whether a woman has a proportionately attractive figure (or instead is overweight or just has an unflattering shape).

The idea is that when a woman is standing up straight and viewed from the side, her breasts should protrude farther forward than her stomach or gut, or at the very least they should stick out equally. If however a woman's stomach or gut sticks out farther forward than her breasts, it is a visual indication that she is either overweight or oddly-proportioned.

Please note: The boob/gut test allows for a wide range of sizes and shapes of women to be considered attractive; the consistent factor is that to be most attractive a woman's breasts should always stick out farther than her gut or stomach. The boob/gut test is NOT to be applied to pregnant women as one would naturally expect a pregnant woman's midsection to enlarge significantly while carrying a child, something many consider to be a very beautiful thing.

Also note: Poor posture (i.e. slouching) often causes easily-avoidable boob/gut failures.
Two guys sitting in a bar, looking over at a couple pretty ladies nearby:

Greg: "Hey Jim, take a look at the woman there with the red hair and the green eyes... she is so pretty! I really want to go talk with her and meet her!"

Jim: "Hold on a second, Greg-- I agree she's quite attractive... But wait until you see her standing up so you're sure she passes the boob/gut test. You remember what happened last weekend when we talked with those ladies at the tiki bar."

Greg: "Good call, Jim. I do want to make sure she is as sexy as she is pretty before I ask her out!"
by Casually Observant March 13, 2019
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Jun 4 Word of the Day
The phenomenon of having to come out as bisexual to the same person/people repeatedly because they assumed or hoped that your sexuality was a "phase." Refers less to the holiday and more to the 1993 Bill Murray comedy film in which the main character experiences the same day over and over.
"My visit home turned into Bisexual Groundhog Day. My mom acted shocked when I told her I'm going to Pride next week, so I had to come out to her as bisexual AGAIN."
by Tiggy Upland April 15, 2014
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