/ snɒg; NAmE snɑːg; snɔːg/ verb
( -gg- ) ( BrE , informal ) ( of two people ) to kiss each other, especially for a long time :
[ v ]
They were snogging on the sofa.
[ vn ]
I caught him snogging my friend.
► snog noun [ sing. ]
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WORD ORIGIN
1940s: of unknown origin.