If you think it's a steal then it's correct to test the water postflop. I do it often. It's a legitimate strategy. I'll tell you what I did last night playing the role of the thief..

I had 72 offsuit in BB. Only one guy posted, so I raised. He called and the flop came 8h Kh 3s. I bet half the pot. He raised 3x the amount I bet. I raised it to 6x my original bet. He folded I showed. Hahahahaha.