One third of half of an ass is not one third of an ass…
Assuming the crew was Leela, Fry, and Bender:
Leela was definitely a whole ass, meaning bender and fry combined to equal negative half an ass, leaving the final at half assed.
So if Bender is 1/3 of an ass, that would make fry -5/6’ths of an ass.
A fellow meatbag did the math on this, apparently Fry is worth - 5/6th’s aof an ass.
And here i am, reading this and hearing roberto’s “he-hAA” as he stabs with a knife. Good news! Some voices are just carved in my mind i guess.
One half of one third assed*
Google says original comic - https://viewcomiconline.com/futurama-comics-issue-37/