expression, noun, noun or participle which takes 'suru'
on edge; in suspense; scared stiff
Vivid, colloquial, and masculine expression for being extremely nervous or frightened, literally comparing the feeling to one's testicles moving up and down. Often used in casual male speech.
See also: 上がったり下がったり (あがったりさがったり)
While waiting for the exam results, I was on edge.
あのホラー映画を見て、金玉が上がったり下がったりしたよ。
Watching that horror movie, I was scared stiff.