It means that you're hot and sexy, and also good enough to eat!
Person A: You're such a shag muffin!
Person B: Thanks!
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noun
1. Pussy, esp. one that hasn't been shaved. The general pubic area of a woman. See also; shag, muff, gash.
2. A woman who is "shaggable" or "shag worthy".
Fav: I'd go down on that shag muffin.
Ant: You would, you carpet banger!
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to be shocked or amazed at something, in awe
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