[1] : 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

[2] : WordNet (r) 2.0

soul kiss
     n : an open-mouthed kiss in which your tongue is inserted into
         the other's mouth syn: deep kiss, french kiss
see also:
deep kiss french kiss 

Soul Kiss >> S Words
Soul Kiss, definition of term: Soul Kiss
soul+kiss_pag1.html

Soul >> S Words
Soul, definition of term: Soul
soul_pag1.html

Kiss >> K Words
Kiss, definition of term: Kiss
kiss_pag1.html

Soul Mate >> S Words
Soul Mate, definition of term: Soul Mate
soul+mate_pag1.html

Kiss Principle >> K Words
Kiss Principle, definition of term: Kiss Principle
kiss+principle_pag1.html

French Kiss >> F Words
French Kiss, definition of term: French Kiss
french+kiss_pag1.html