Dictionnaire Infernal
Gaap (also "Tap", "Coap", "Taob", "Goap") is a demon that is described in demonological grimoires such as "the Lesser Key of Solomon", Johann Weyer's "Pseudomonarchia Daemonum", and the Munich Manual of Demonic Magic, as well as Jacques Collin de Plancy's "Dictionnaire Infernal",