Glubber

From RWP Wiki

Glubber is a substance found in the Banjo-Kazooie series. Glubber is a liquid which is normally a silvery color, but can be made a different color through the use of a "flavor" tablet.

In Banjo-Kazooie: Nuts & Bolts, grape-flavored glubber can be found running through the pipes of the LOGBOX 720 game console, and is part of the cooling system. At the very top of the console is a pool of glubber, which is the sight of the game world's Grunty Challenge, Flush the Floater. In this challenge, Grunty threatens to have Piddles the cat leave a "surprise" in the glubber pool unless Banjo and Kazooie beat her in a race. Another challenge, titled Glubber Hubbub, has Bottles asking Banjo and Kazooie to replace the glubber's grape flavor tablet, as it is wearing off, and grape-flavored glubber is apparently the most efficient kind.