Not sure if you have a dictionary but apparently the 2009 edition of the Aviation Complete Abbreviations Sayings Spellings (Gosh does that spell ACASS ?) contains the following....
AIRCRAFT .... devices to be crewed by professional aviation staff and flown for the benefit of passengers
ACASS ....to be shafted by one's superiors/a lack of back up from colleagues at head office/rats deserting sinking ship /the dawning of false promises especially in French speaking countries near North America.( see also ASSACHE )
ASSACHE.....(anagram of ACASS specifically Higher Echalons) severe pain in the derriere region (also near North America!) commonly occurring during periods of employment or conversely unemployment experienced by freelance or contracted aviation personnel of ACASS
ALLEGEDLY
Available soon from all good bookstores and FBO,s worldwide !!