Girls, Why do girls "ball tap" guys/their guy friends?

Anonymous
A lot of girls at my school like to "ball tap" their guy friends, and it really annoys me since... ya know. But why? I'm open minded to the fact that there might be a reason that I see girls do this around my school (typically to their friends) and they laugh and stuff, could you enlighten me on why you do it if you've done it or seen it done?
Girls, Why do girls "ball tap" guys/their guy friends?
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