If you have a hunch about something, you feel an intuition about it that's not based on evidence. It's very close to "I feel like [something]" and you would use it in a sentence similarly. "I have a hunch that the burger we ate at Bob's burger place gave me food poisoning last time."

Hi Dan, Nice question. Examples of use. . . "I've got a hunch, that I am going to win the lotto." "I've got a hunch, that it's going to rain." "I've got a hunch, that the party will be a good one".