The phrase "stringy stuff" refers to things that are thin and long, like strings. It is used to describe something with a similar shape or texture, such as noodles or certain types of hair. Full definition
Once it is cut in half, clean out all the seeds and yucky stringy stuff. (thefoodcharlatan.com)
Baked Fresh Pumpkin — Preheat the oven to 350 degrees F. Cut the pumpkin in half and clean out the seeds and stringy stuff. (carrotsandspice.com)
You may have to peel off the membranes — that stringy stuff that covers the «meat» of the orange before you serve it however. (wholesomebabyfood.momtastic.com)