Lyric discussion by therymz 

Cover art for Orestes lyrics by A Perfect Circle

Its pretty obvious. The main dillema Orestes has in the myth is wether it okay for someone to kill his mother to avenge his father. Hence "Snip away this umbilical residue/Keeping me from killing you."

obviously he is using orestes as a metaphor, you jackass. this song goes much farther into the relationship of mother and child.

i don't find a need for the language but i somewhat agree. it seems like he wants to get his mother out of the way of so he can get some peace out of drugs, "give me one more medicated peaceful moment i don't wanna feel this overwhelming hostility". he wants to cut off their connection because she's keeping him from his fix.