Bulge misinterpretation
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When someone looks at a guy in a [swimsuit], or in tight boxers, and misinterprets the size of the penis in it. Usually, [bulge misinterpretation] (or [BMI]) is only used when the estimate was in the favour of the estimand, i.e. several sizes too large.
Bulge misinterpretation meaning & definition 1 of Bulge misinterpretation.