The slightly more rounded appearance of the female lower abdomen which can be very sexy and often illustrates a woman is entirely happy and confident in her own body.
Not to be confused with "Muffin-top" which is when flesh spills over the waistline of clothing and is completely unsightly.
A Spunk-Belly can often be the subject of sexual fantasy.
"Nice dress, you can see the outline of her cute little Spunk-Belly too"

"I'd love to crack one off over her rounded little Spunk-Belly"
by Tantalus2009 April 24, 2009
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When a woman has a flabby swollen belly and she wears tight fitting clothes for all to see it. Looks as if pregnant but is not.
Wow look at her spunk belly it's huge
by Ace P Princess April 12, 2018
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