What does “Mmph” mean from a guy?

Ok so I overheard my co-worker that I have a crush on talking to his friends about me, which he didn’t know I could hear them. But anyway he said something to his friends like “She’s so, mmph!” Other people have given me hints that the guy likes me but sometimes he’s hard to read and I don’t wanna confront him about it just yet. I don’t wanna end up scaring him away if I say something too soon. But what’s with the little “Mmph/Mmm” sound effect? Is that a way of him saying I’m attractive or something?
What does “Mmph” mean from a guy?
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