How to throw with Yoko-Guruma
2. Grab around the waist and as you move around in a circle, stick your leg out
3. Use the circular momentum, lift and wheel your partner over onto their back.
Guruma means wheel
For example, another common technique which uses this wheel movement is O-Guruma. With O-Guruma tori (attacker) uses their leg as the point of pivot and wheels their partner over their leg.
This technique is a banned technique through the IJF rules (where you can’t touch the trouser leg) but remains a part of the Gokyo and here is information on how to do the throw by the Kodokan.