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A case of plexiform variant of arterio-venous malformation in the mandible presenting with a persistent profuse bleeding from the gingival sulcus, engorged and pulsatile neck vessels with palpable thrill and bruit on auscultation in the submental and right submandibular region is presented. Intraorally, the patient had blood clots as well as fresh bleeding from the gingival sulcus, mobile teeth, swollen gingivae and poor oral hygiene. An evaluation of the clinical history and examination including radiographs and a massive life-threatening bleeding from the gingivae allowed us to carry out surgery for a total removal of the malformation. The present case report describes this rare condition and discusses the clinical presentation as well as the surgical management of the patient, including the encountered peri and post-operative complications.