Siktir lan
'Fuck off man/dude' or "Get fucked man/dude'. The Turkish verb 'siktirmek' meaing literally meaning "to become fucked" is often compounded with the word 'lan' meaning something like 'dude' or 'man'. When added together these two words become a beautiful, melodious swearword.
Siktir lan orospu cocugu!
Fuck off man, you son of a bitch!