-ussy as a fuffix is not gender-specific. on top of that, bussy is already a form of -ussy, for the word boy. Boyussy does not work, due to y acting more like a vowel in context of the word as a whole.
using bussy in place of -ussy is never applicable. To use bussy means you are using Bussy as a descriptor, not as a noun (ex: dolphin bussy instead of dolphussy.) This is true for all words, even when spelling and/or pronunciation is not immediately obvious. (Ex: Ohio, while one thing might need to use Ohiobussy or Ohbussy, is spelled Ohussy, pronounced Oh-hussy. Some could argue for Ohiussy, pronounced Ohi-ussy, but that results in -ussy still being seperate from the word, not integrated.)
I hope this clarification helps!
Gimme gimme chicken tendies, be they crispy or from Wendys. Spend my hard-earned good-boy points, on Kid's Meal ball pit burger joints. Mummy lifts me to the car, to find me tendies near and far. Enjoy my tasty tendie treats, in comfy big boy booster seats.