Side-handed

Lightning drew in on his tail and I gave my lariat a side-handed pitch.

Source: wiktionary

With a motion so smooth and fast Marco could barely track it, the man at his side whipped the metal bar in a side-handed toss.

Source: wiktionary

A sideways or side-handed throw may be necessary to avoid obstacles, toss it into a small opening, or throw it around a corner of a building or trench angle.

Source: wiktionary

Mallory tensed, and as the policeman passed the door, he stepped out, brought his hand over and down in a side-handed blow to the base of the neck that had every ounce of power in his shoulders behind it.

Source: wiktionary