What is this nasty slimy lump in my half and creamer?

There are a few possibilities for what the slimy lump in your half and creamer could be:

- Curdled milk: If the creamer was added to hot coffee, it may have caused the milk proteins to curdle and form a slimy mass. This is especially common if the creamer contains stabilizers or emulsifiers, which can make it more susceptible to curdling.

- Spoilage: If the half and creamer have been sitting out at room temperature for too long, they may have started to spoil. This can cause the milk to curdle and develop a slimy texture, and may also cause the creamer to separate and become watery.

- Contamination: If the half and creamer were not properly stored or handled, they could have become contaminated with bacteria or other microorganisms. This can also lead to the formation of a slimy lump, and may cause the half and creamer to have an off flavor or smell.