This might fall under the category of "I don't get your punchline" Snarkies. If you've ever made a souffle, or any baked goods that required "rising", such as a cake, then this is hopefully a bit more amusing. To top it off, I don't think "bake sale" is as common a practice elsewhere as it is at my company. Basically it involves scoping out some features, doing some POCs, and then showing the business what they'd get for their investment...and when. Perhaps they're called garage sales elsewhere.
The intent is to really lay out, for negotiation, all the possible options with just enough visibility to make it understandable. The presentation method forces a bit of prepareation. Matthias Marschall has a good article that doesn't cover bake sales, but does discuss feature negotiation.
How Non-negotiable Features Kill Software Products
"If features are pre-sold without any option to negotiate what’s important and what may be left out, you inevitably end up with too much complexity. Sales representatives often feel pressure to promise too much to a client. They want to close a deal, but they’re not able to see the technical implications. They raise very high expectations and often fix them in the contract which removes any way to iterate and develop your product until it’s actually useful for your client."
Title: He's a stomper.
Snarky: He said we're having a bake sale. I asked if all we were showing off were souffles.