It is very hard to put into words how I feel about a particular hand, but I was in a heads up situation once where the other player was playing very aggressive and I was getting sick of being bullied and pushed around.
I was dealt K 3 of clubs in one such hand and he pushed all-in, I called and turned over my hand he was stunned and sat there grinning he had the A K off suit and I said "I have a gut feeling about this hand" Flop, Turn, bricked for both of us, I hit the 3 on the river and he was shocked, "always trust your gut" I said.
A little later He raised on me in another hand and I thought he was stealing so I 3 bet with K Q of Diamonds and he pushed again, this time my gut said fold I wished I had followed my own advice as he held pocket Kings and took me out.
Mind you, the flop came A K Q and it would be impossible for me to do anything but shove all-in with 2 pair.
Gut, Intuition, call it what you want, it works!