expression, godan verb (-ru)
be scared stiff; shrivel up in fear
Vulgar, emphatic expression for extreme fear, literally 'one's testicles shrivel up'. Used mainly by men in very casual, rough speech.
あの先生に怒鳴られて、金玉が縮み上がった。
When that teacher yelled at me, I was scared stiff.
お化け屋敷に入
When I went into the haunted house, I was so scared my balls shriveled up.