Other ways to say "I have a bad hunch"
fore·bod·ing:
noun - fearful apprehension; a feeling that something bad will happen:
with a sense of foreboding she read the note
adjective - implying or seeming to imply that something bad is going to happen:
when the doctor spoke, his voice was dark and foreboding
Synonyms: apprehension, anxiety, trepidation, disquiet, unease, uneasiness, misgiving, worry, fear, fearfulness, dread
I've got a baaad feeling about this.
(Note that this does have a certain pop-culture reference...)
Consider premonition
an intuition of a future, usually unwelcome, occurrence; foreboding
Also
- forboding
- dread
- apprehension
- presage
- shadow
- feeling in his bones
ominous
- giving the impression that something bad or unpleasant is going to happen; threatening; inauspicious.
Excerpt from The Woman in White by Wilkie Collins
I felt the ominous future coming close, chilling me with an unutterable awe, forcing on me the conviction of an unseen design in the long series of complications which had now fastened round us. I thought of Hartright--as I saw him in the body when he said farewell; as I saw him in the spirit in my dream--and I too began to doubt now whether we were not advancing blindfold to an appointed and an inevitable end.
I was just about to suggest expressing it with reference to your 'doomdar', as in radar, gaydar, etc. I'd never heard the term before, and decided to Google it (always a good idea before claiming a neologism, especially when it seems so obvious.) The search brings back about 8300 results, very few of them actually finding the the word as a word, in the sense I'm suggesting it. But the very first hit goes to the Urban Dictionary, where the word is defined in terms very close to the OP's original question.
The innate intuition of impending Doom that a person feels before the Event of Doom actually occurs. Operates at the same intuitive level as GayDar and GameDar.
The word comes up a complete blank at the nGram viewer: "No valid ngrams to plot!"
So in use, it would be something like: This [situation] is tripping my doomdar.
Note: I'm not citing the UD as an authority, just as evidence that the word does make intuitive sense. Whether it would be appropriate in any given context is another story.