For over a year i have had messy peanut butter like bowel movements now pencil shaped also a good amount of mucas at times. what could be going on ?

Alteration in stool: Inflammation, infection, ibs may cause abdominal discomfort, altered /alternating stool pattern, +/- nausea, bloating, gasiness. Often improved by stooling, ibs is defined by changes in perception of gut distension, motility, sensation. Diet &emotional stress play significant roles here in patients with ibs, but first rule out inflammation, ischemia, & infection, malabsorption/maldigestion, cancer

Need evaluation. : Whatever this may ultimately be, you need to be evaluated by a Gastroenterologist right away. This could be related to infection, malabsorption or enzyme issue. At the least you'd need some blood testing, abdominal ultrasound, abdominal CT, EGD and colonoscopy, I would think.