Ruddering

[Julian]

That acts as a rudder; that guides or steers.

[Michiko]

When someone uses there hand to knock a standing mans [flacid] penis from [side to side]. The equivalent of [motorboating].

Can also do tennis ruddering when you use both hands and bounce the penis between them.

Also possible to do it up and down or with your foot.

Surprisingly satisfying for both particiants

[Julene]

When you stick [your face] in [someones] ass and [proceed] to motorboat them