Iron knuckle 

The sexual act of placing ones penis in an area that the other is unfamiliar with the penis being

Dude My girlfriend wanted an iron knuckle last night.

Iron knuckle by Igor_Keck February 8, 2021

iron five knuckle pron shuffle 

Rather than refering to masturbation, the iron 5 knuckle pron shuffle refers to:
1)getting fisted by a large man/a group of men
2) getting completely obliterated by an obviously stronger person/force; Synonyms- Pwned, Owned, Destroyed

Guy 1 :So I was playing Ninja gaiden and-
Guy 2 : lemme guess, they did the iron five knuckle pron shuffle?
Guy 1 : I fucking hate you

iron five knuckle pron shuffle by Senor Bear July 26, 2007