A term of endearment designed acknowledge the high value of an item of others which does not resonate or have any desirable qualities to yourself .
(Derived from an antiquated decorative vessel for sauces that are essentially obsolete, which were collected at a point in American history)
Thomas: check out this badass limited edition Cowboys jersey I got signed by Dak Prescott!
Haley: That’s a glorious gravy boat! Go sports!