Used as a noun to describe something or someone that is repulsing to you either by action or nature. It can also be used as a complete sentance in response to information received.
As a noun:
Indian food is disgustable.
The work he did on my house is disgustable.
As a response to information received:
Party A:Giovanni cheated on his wife, contracted an STD, and passed it on to his wife not knowing.
Part B: Disgustable!
Something so disgusting you almost don't have a word for it.
Kind of like "Fucking disgusting", or "Disgusting as fuck", but really, there was no word for this sense of disgust until "Disgustifuck". Origin is unknown, but probably arose after a night of drinking and a long emotional battle to describe someone (or something) entirely repugnant.
Your mom's cooch is disgustifuck.
That brodawg over there is disgustifuck.
STDs are disgustifuck.
Nazis are disgustifuck.
Your keyboard is disgustifuck.
etc.