Weak peristalsis in esophageal pressure topography: classification and association with dysphagia. Am J Gastroenterol. 2011;106:349–56. Richter JE, Castell DO. Diffuse esophageal spasm: a reappraisal. Ann Intern Med. 1984;100:242–5. [revactamedica.sld.cu]

And Jackhammer, the one you just witnessed carving that woman's face off, will cut holes all over your body for fun just because he thinks it looks pretty. [context.reverso.net]

Esophageal hypertensive peristaltic disorders. Neurogastroenterol Motil. 2012;24(Supl 1):S32-9. Gyawali CP, Bredenoord AJ, Conklin JL, Fox M, Pandolfilo JE. Evaluation of esophageal motor function in clinical practice. [revactamedica.sld.cu]