I have had that happen with one of my Columbian Red Tails. I can only feed her Prekilled or rats that I have frozen. I bought a batch of colossals from RodentPro(not to diss them or anything they are quite good)last year and anytime I fed her one she would puke it up several days later and then for the next time she had a bowel movement it was runny and reeked!. But she was the only one that did it my other snakes were fine eating them. Maybe your snake has a sensitive stomach (as much as that sounds weird). Or it could have just been a bad rat, maybe been frozen too long and had freezer burn or it wasn't thawed enough. Wait two weeks and try again. Do it too ealy and it may just keep puking it up.
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1.1.0 Pastel Columbian Boas
1.2.0 Burmese Pythons (Albino. Green, Labryinth.)
1.4.0 Cal King
1.1.0 Corn
1.0.0 Red Tegu
1.1.0 Ball Pythons
1.2.0 Dogs (English Mastiff. Jack Russel, lab mix)
1.0.0 Cat

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• Burm spits up! - snakefreak666, Tue Dec 4 22:57:13 2007
• RE: Burm spits up! - laurarfl, Wed Dec 5 05:57:14 2007
• RE: Burm spits up! - Wildsidepets, Wed Dec 5 12:14:25 2007
• RE: Burm spits up! - GrotesqueBurgess, Wed Dec 5 18:58:15 2007
• RE: Burm spits up! - snakefreak666, Thu Dec 6 01:29:09 2007
• RE: Burm spits up! - laurarfl, Thu Dec 6 09:49:11 2007
• RE: Burm spits up! - snakefreak666, Wed Dec 5 16:23:04 2007
• RE: Burm spits up! - HappyHillbilly, Wed Dec 5 19:29:51 2007