affectionate play (or foreplay without contact with the genital organs)
<noun.act>
Neck \Neck\, v. t. [imp. & p. p. {Necked}; p. pr. & vb. n. {Necking}.] (Mech.) To reduce the diameter of (an object) near its end, by making a groove around it; -- used with down; as, to neck down a shaft.
Necking \Neck"ing\, n. Same as {Neckmold}.
neck \neck\, v. i. To kiss and caress amorously. [Colloq.] -- n. {necking}. [PJC]