Rusty Fence
When a woman sits on a person's face in the act of cunnilingus, while she is having a heavy menses flow.
I asked her to sit on my face and she gave me a rusty fence!
Rusty Fencing
When two homosexual men are done having unprotected anal sex, and they pull out their hard, shit-covered penis' and proceed to "duel" with them.
At the end of a mutual, hard, sweaty session of unprotected anal poundage, Adam withdrew from Sheldon and challenged him to a healthy bout of Rusty Fencing.