The phrase you use when you aren't really thinking straight and you want something or someone to do something for you. It can basically apply to anything. It can also be an expression of shock or a method of questioning.
Granny: Please can you pass me the, er, fecksa fooksu fucksa, dear?
Child: The phone?
Granny: Yes. The fecksa fooksa fucksa
or:
Person 1: Where the fecksa fooksa fucksa have you been?
Child: The phone?
Granny: Yes. The fecksa fooksa fucksa
or:
Person 1: Where the fecksa fooksa fucksa have you been?
by UrbanLingoGuru July 19, 2011