I own a copy of the complete OED (the Compact OED, to be specific, which has the complete OED reproduced into one volume with 9 original pages printed on each physical page, and it still has 2371 pages of definitions), in which this ``word'' does not appear. It does, however, for example, include the word ``asa3t''. That fourth letter is a three. I'm sure it has some name, but it's simply not a letter I'm familiar with, and it certainly hasn't appeared in the English language for quite some time.

Oh, and my OED has two definitions for ``snog'', neither of which are what I assume your definition would be. However, it does list ``snogging'', which would see to be what you're talking about, and it lists inside that definition the word ``snog'' as a modified form.