Does this happen when you also eat nuts too?
Oh yeah, I weigh about 175 lbs, 6'1, and 19 years old
Nope, this only happens when I eat peanut butter.
Allergy to peanuts would be to all forms of the peanut, not just peanut butter. It sounds like it is the undisgested part of food which happens with high fiber foods (peanuts). If you are concerned, see your MD.