The action of physically grabbing someone's head or face and french kissing them with force. Often happens in public situations e.g. a bar or club. In severe cases, this can be referred to as 'face rape.'
That guy totally just grab snogged me!
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The action of propelling ones body on to that of another person and French-kissing them with force. The over-zealous cousin of the 'grab snog'
I can't believe I launch snogged him!
(The scene from 'He's Just Not That Into You' when the female lead launches across the sofa to kiss the object of her affection, Justin Long)