So basically...
These kids need therapy.
"Coin Boys" Story refers to a viral post on Reddit's /r/teachers subreddit in which a teacher laments that several of his students have developed an entire identity around flipping coins, such as using coin flips to make vital decisions like whether or not to do assigned work. Though the teacher felt exasperated by the apparent fad among his students, many social media users thought the concept of "coin boys" was humorous and cheered on the students. However, the story is potentially fictional and made up, as the person behind the account is the creator of several other posts in weeks prior in which they discussed having different professions unrelated to teaching.
This may be quite easy to deal with.
1) find some other teachers in your school who experience this.
2) make sure each of you has a quarter.
3) every time a kid does this in class, do the same, though it will mean something very different.
To wit: the percentage of marks he/she loses off the current assignment every time he/ she tosses the coin.
4) Alternatively, co-opt the practice entirely, rendering it utterly uncool and therefore extinct.
Hope something here helps.