Combination of the words Yiff + tiddies
Daumn I love yiddies... On yiddies
The final evolution from the words Bussy - Badussy - Busdussy - Busdus.
Usually used as an emphasis at the end of a statement by saying "on busdus" the same way someone says "on my momma"
Bro I just got 100% on my test. On BUSDUS!!!