Promění ho v úplnou děvku

This twerp had barely turned 18 when he got into serious trouble. Young people these days, with their sense of entitlement and complete lack of household discipline growing up, have their heads messed up at the outset, and it's a shame. Of course it doesn't help that precious brain cells get destroyed in the process of all these high-schoolers lazing around "recreating" and doing anything other than finding something productive to do.