"holy fuckin shit" is the adult version of "OMG". When a person is in complete awe or disbelief of a sensory input, this term is commonly used. It is a modified version of the much used "holy shit", only intensified by the versatile word fuck. It is usually used in extreme cases of all kinds.
by talkie tooter January 27, 2012
by ~§hadow~ November 22, 2016