Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.3.2)
// ----

@mixin ohgodwhy {
  %red {
    color: red;
    border-bottom: 2px solid red;

  }
  
  %green {
    color: green;
    bordor-bottom: 2px solid green;
  }
  
  .wat,
  .ok {
    @extend %red;
  }
  
  .why {
    @extend %green;
  }
}

.something {
  @include ohgodwhy;
}

.otherthing {
  @include ohgodwhy;
}

SassMeister-output.css

.something .wat,
.something .ok {
  color: red;
  border-bottom: 2px solid red;
}

.something .why {
  color: green;
  bordor-bottom: 2px solid green;
}

.otherthing .wat,
.otherthing .ok {
  color: red;
  border-bottom: 2px solid red;
}

.otherthing .why {
  color: green;
  bordor-bottom: 2px solid green;
}