cart goblined

(verb) The past tense act of a mythical goblin having stolen the content(s) of your shopping cart during online checkout, leaving you empty handed.

I was in the middle of checkout, but I got cart goblined!

cart goblin

(noun) A mythical goblin that steals the content(s) of your shopping cart during online checkout, leaving you empty handed.

I was trying to buy a low print run comic book, but the cart goblin beat to me.