I think you are all wrong people .. I know russian since I was born there and I still remember it well ..
Gofuckyourself means
" Idi sam zasun svoy chlen sebe jopu" or
" Idi sam ebis sebe " (tipa tot kto govorit ebatsya ne hochet ) or
" Idi sama zasun sebe (pohuy chto) v pizdu ili v jopu"
And the last one .. short one..
" Idi sama ebis"
This is the way I hear it ..
