The act of over Rusty Shafting
' entering from behind, thus making his 'shaft' 'rusty' or 'browned' (covered in excrement) in the process.)
Ewan - "Pounded your Mum so hard last night that she ended up making my pole red!"
Jack (Friend) - "You were Red Shafting my mum?"
Ewan - "Hell Yea!"
Jack - "Cheers, she needed that!"