In Holden's Case, it means to "neck" with a female; kissing as some may say, or sexual activity. When Giraffes mate or "kiss" they have their butting of heads, a competition for the males to neck the other male away.
Whether it's meant by pleasing somebody or giraffes necking each other to get the female, it's all brutal.
I don't why I wrote this. So pointless. Necking! ..
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