When an obese man (or Flubber Grubber) holding his stomach-roll up in order to facilitate fellatio accidentally let's go suffocating his partner, he is said to have given his partner a Flubberguzzler
When you go down to eat a girl out, and instead of hitting her vagina you end up with a roll of blubber in your mouth similar to that of a humpback whale.
Boy 1: I was so drunk last night when I took her home that when I pulled my tongue out I didn't realize that I had flubbergutted her.