Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.13)
// Compass (v1.0.3)
// ----

.thingy {
  background: blue;
}

.i-want-to-extend {
  @extend .thingy;
}
.i-want-extend-again {
  @extend .thingy;
}


/* I really don't want .i-want-to-extend/.i-want-to-extend-again here at all */
.header .thingy {
  margin-left: 5px;
}
.sidebar .thingy {
  padding: 5px;
}
.footer .social .thingy {
  background: green;
}

SassMeister-output.css

.thingy, .i-want-to-extend, .i-want-extend-again {
  background: blue;
}

/* I really don't want .i-want-to-extend/.i-want-to-extend-again here at all */
.header .thingy, .header .i-want-to-extend, .header .i-want-extend-again {
  margin-left: 5px;
}

.sidebar .thingy, .sidebar .i-want-to-extend, .sidebar .i-want-extend-again {
  padding: 5px;
}

.footer .social .thingy, .footer .social .i-want-to-extend, .footer .social .i-want-extend-again {
  background: green;
}