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Webster 1913 Edition

Noun.

Same as

necking

necking ‎(countable and uncountable, plural neckings)

A behavior among male giraffes where they hold combat for social dominance using their necks as weapons.
- 2005, Barbara Keevil Parker, Giraffes, page 26:
  Necking helps young male giraffes test which one has a stronger neck.
(architecture) A neckmould.
(slang) Chugging beer.
for Lent, he gave up necking and cigarettes
(slang) Making out; kissing profusely, especially on the neck.