(verb) unintentionally have your neck muscles tense up and/or freeze when in the presence of someone attractive, often to the point where it is obtrusive and creeps out the other person
Chris and Nadir were having a fun, loud conversation on the rooftop bar. As two hot women walked by, they both stiffnecked and went quiet, causing the women to give them strange looks and move on.
by welcometothejungle2009 August 31, 2017