Another "cuckoo's question"

[Goloviznin Konstantin]

Hello all,

I've got another question out of  "...  the cuckoo's nest". In the subtitles to the movie there is a phrase McMurphy tell the chief :

Goddamn, boy,
you're as big as a mountain!
 
But really it can be heard as: 

Goddamn, boy,
you're VULL ( or BULL or even BUD) as big as a mountain!
  
I'm very interested what really  is instead of these  VULL /BULL /BUD?

Thank you in advance, 
Konstantin

P.S.: The fragment (=Mc's talk to chief) of this movie I've uploaded here (with subtitles): 
http://depositfiles.com/files/w54c9sjm9


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