Snogging

It's one of those words, isn't it?

We are snogging. I snogged him. I want a snog.

Ooh, look at those people snogging.

What is a snog?

The Oxford English dictionary says

snog

Brit. informal

• verb (snogged, snogging) kiss and caress amorously.

• noun an act or spell of kissing and caressing.

Google comes up with a strange definition:

snuggle and lie in a position where one person faces the back of the others

And there's some tips here on how to get a snog -

The average person will spend approximately two weeks of their whole life snogging!

So, what, to you compromises a snog? Is it a snog if it is merely a prolonged kiss on the lips? Or is it a snog if the lips are parted? Must it involve tongues? And how important is it what the rest of the body is doing - is a long lip kiss with groping a snog, or does it have to involve tonsil licking? The Urban Dictionary seems undecided whether tongues are essential or not, or indeed whether a snog is

A French version of the hot-dog. Is eating with mayonnaise and grease.