Pettanko: Shelly. Makes up for it by an obsessive interest in lingerie despite her tomboyness.
Pettanko is not a trope. UsefulNotes.Pettanko is a fanspeak term definition only. The tropes are A Cup Angst (girl is sensitive about her lack of size) or Petite Pride (girl is proud of her flat-chestedness). Anything else is not a trope. Please return this example to the page under the correct trope if (and only if) it fits one of those two tropes.
Also, the idea that a girl has to "make up" for her lack of breast size in some way is disgusting.