font-awesome-animation/scss/tada.scss

$faa-tada-speed: 2s;
@keyframes tada {
  0% {
    transform: scale(1);
  }
  10%, 20%  {
    transform: scale(.9) rotate(-8deg);;
  }
  30%, 50%, 70%  {
    transform: scale(1.3) rotate(8deg);
  }
  40%, 60%  {
    transform: scale(1.3) rotate(-8deg);
  }
  80%, 100%  {
    transform: scale(1) rotate(0);
  }
}
.faa-tada.animated,
.faa-tada.animated-hover:hover,
.faa-parent.animated-hover:hover > .faa-tada {
  animation: tada $faa-tada-speed linear infinite;
}
.faa-tada.animated.faa-fast,
.faa-tada.animated-hover.faa-fast:hover,
.faa-parent.animated-hover:hover > .faa-tada.faa-fast {
  animation: tada ($faa-tada-speed * $faa-speed-coeff-fast) linear infinite;
}
.faa-tada.animated.faa-slow,
.faa-tada.animated-hover.faa-slow:hover,
.faa-parent.animated-hover:hover > .faa-tada.faa-slow {
  animation: tada ($faa-tada-speed * $faa-speed-coeff-slow) linear infinite;
}