The Collaborative International Dictionary of English v.0.48:
soul kiss \soul" kiss`\, n. A kiss in which both parties have their mouths open and pressed together, and the tongue of one or both is maneuvered within the mouth of the other. Syn: French kiss, deep kiss. [PJC]WordNet (r) 3.0 (2006):
soul kiss n 1: an openmouthed kiss in which your tongue is inserted into the other's mouth [syn: soul kiss, deep kiss, French kiss]