saw half way up the ass...

a situation which you can not deal with, (cannot remove or shove in the saw 'coz either ways your ass is torn) or leave it as it is...
a situation in which no matter what you do you are fucked...
do and die, don't do and still die situation...

tony: hey, how is jimmy's relationship thingy goin on?
sam: dont ask! looks like jimmy's got the saw half way up the ass...