Interesting 1/2 hand

playing 1/2 nl loose player utg raised 15 dollars but flashed a 2. He said cowboys. There were 2 other callers and I called from the bb with Q8o. Flop was K45 rainbow. It was checked to mr loose who bet. Since I knew he didn't have a king I moved in. However I was shocked that he called and showed 23. I made an 8 on the river and took down a 400 dollar pot.