What does call for old school mean

Call for an old classmate means: to cheer for one's old classmate!

Key vocabulary: play call

Playing call, a popular word on the Internet, is a kind of wota art, which is a concentrated expression of support and affection for the artists on the stage, which seems to be crazy, but is actually rational. mainly embodied in the off-stage neatly organized shouting and a sea of fluorescent sticks. Playing call comes from the Japanese concert Live support culture, and later widely referred to the love and support for someone.

On the afternoon of December 12, 2017, Bite the Words assessed the top ten buzzwords of 2017, and "playing call" was listed among them.On December 18, playing call was selected as one of the National Center for Language Resources Monitoring and Research's " Top Ten Network Words of 2017."

Expanded:

The term first came out of the Japanese concert Live support culture, which was originally a dance or pumping action performed by otaku or Japanese idol supporters, which included jumping, clapping, waving of the arms, and rhythmic chanting of slogans. In Japanese support culture, if fans can make neat movements and shout slogans with glow sticks and other glowing objects during an idol's performance, it can be a very important encouragement to the idol who is performing hard.

With the gradual popularity of this culture, a call-out culture has also developed in the country.