-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!

. This is your kawaii kouhai Aya-chan, calling in from Nihon. I have noticed a severe lack of cute emotes in chat tonight, and instead all I see are baka dansgame and baka nammers. This is not very sugoi, and I would appreciate it if your chat showed more respect for Japanese culture by typing kawaii emotes like