'soul kiss' definitions:

Definition of 'soul kiss'

noun

An openmouthed kiss in which your tongue is inserted into the other's mouth [syn: soul kiss, deep kiss, French kiss]

From: GCIDE

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]