They also have a dick, which, under any reasonable framework that says "boobs are a female feature", would be a male feature. You cited the relevant definition right there! People use the more narrow definition of androgyny they have in their heads (which is usually something like "lacking any obvious gender markers") but if you look at the definition you copied there, that's not even the primary definition of androgyny! The bearded lady also has boobs, but she is androgynous. The word means, and has always meant, of indeterminate gender. Someone with breasts and a dick will always qualify, so long as the concept is meaningful at all.
To put a fine point on it - one way to be androgynous is to have no obvious gender signifiers, and that seems to be the method people are more familiar with (see: David Bowie or thin women in pantsuits and short haircuts). But another way to be androgynous is to have male features (andro) and female features (gynous), making you of ambiguous gender. If, for instance, you had a turtle with long claws (male) and a short, thin tail (female), it would be androgynous.
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Check out the first and second definitions to see both the source of the confusion and which definition comes first.