This move is not part of the standard Wolf Fang Fist combo, despite the name. It is bound to quarter-circle-back and light, medium, or heavy attack. The light version does less damage, starts up the fastest, and causes a soft ground bounce. The medium version does more damage, starts up slower, and causes a slide-out knockdown. The heavy version costs 1 bar of ki and causes a slide-out knockdown, does more damage, starts up quicker than the medium version, and has a larger hitbox. All versions of this move are invincible to air attacks.
This move is seen in the opening cutscene when Yamcha is introduced.