Wasei-eigo (Japanese-made English) from 'go stop'. Refers to a traffic signal. Common in everyday speech, though 信号 (しんごう) is more standard.
wasei-eigo (Japanese-coined English), from go stop
The traffic light at that intersection often breaks down.
ゴーストップが青になったら渡りましょう。
Let's cross when the traffic light turns green.