What do you see this being used for? The only thing I can think of is fast food delivery etc, but there are many better words and combos available for such things, and "belly" is very slang.
The definition formed by the two words are not ideal.
Pedantically it means "to convey a thought about your stomach" or "super speedy stomach" or "stomach train". While marketing and branding would give it clear meaning, businesses wanting to spend a lot on branding tend to jump on a better name to start with.
In summary, you might get a sale from someone, as I've seen such slangy/trendy names used and sold, but not very often at all, which means I I honestly don't think you'll see a sale at all. I think the word "belly" kills it to be honest.
Good luck though - put it on the free marketplaces for a year and decide to renew or not based on views and offers etc