A breast size that, though impressive, is not attractive. This appendage sneaks out of bras in inappropriate places and is never greeted or observed with the same delight as underboob or sideboob.
Damn! A 44DD?! On her, that's just scareyboob!
Wow! (shudder) Did you just see that poppin' out the sides of her Miracle Bra? That ain't attractive; that's just plain scareyboob."