The word “打call" comes from Japan, which originated from the concert Live Support Culture.
It was originally a dance or aspiration exercise performed by idol supporters, including jumping, clapping, waving arms and shouting slogans.
Fans expressed their support for the idols on the stage by regularly shouting, waving the light sticks etc. The existence of “打call" makes idols and their supporters together and creates a warm atmosphere.
But now “打call" is not only applicable to fans' "helping" activities of idols. When you express your approval and support for someone, something, you can say “打call for xx".
For example:
"为kirin mandarin打call"
(打call for kirin mandarin)