Necking can refer to:

• Making out, a term for heavy kissing, and particularly kissing of the neck
• Behavior exhibited by (usually ungulate) animals in which the neck is used as a weapon, often intrasexual and associated with mating and sexual selection.
• The process by which a ductile material deforms under tension forming a thin neck; see Necking (engineering) and Manufacturing.
• British slang for drinking a beverage (usually a pint of beer) in one go.
• Necking down: reducing the diameter of a firearm's barrel to fit a smaller cartridge ^*.

See also: Neck (disambiguation)