soul kiss

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A kiss in which the tongue enters the partner's mouth; a French kiss.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun idiomatic, colloquial A kiss in which contact occurs between the tongues of the kissers.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an openmouthed kiss in which your tongue is inserted into the other's mouth