Yummy vs beautiful?

Why would a guy say a woman looks yummy vs beautiful? what's the difference in when or why you would use one vs the other? I've known this guy for a very long time, years.. we had been in communication via msgs for months now after years of not seeing or talking to each other.. i have sent pictures of myself and he has also, we met up after years of not seeing each other and just laughed and talked. He texted me a few days later, and he said I looked "yummy. ".. why would he use yummy instead of beautiful? (Even tho he has called me beautiful in text plenty of times before)?
Yummy vs beautiful?
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