What are the chunks in my mucus i spit up?

Tonsil stones: Are the "chunks" pale yellow? If they came from the back of the throat, resembling small, fragmented cheese pieces, and have terrible odor, it is likely that you are describing tonsiloliths, or tonsil stones. Tonsil stones are believed to be bacterial growth from bacteria feeding on food debris or particles in the tonsil space. They often cause bad breath, and may be visible when you 'open wide'.

"Chunks"?: Sounds like you mean "tonsil stones" or "tonsilar calculi" or "tonsilloliths." they're mostly just calcium, usually about the size of a grain of rice and they smell horrible if you mash 'em! they are not an infection. They appear in some people and not others because of differences in the structure of tonsils. Don't worry about them, just don't ever bite 'em - they taste awful!