A phallus (penis) after sexual intercourse. (Typically used after a male loses his virginity).
Dave: Robbo, heard you had a big night last night, how's the bruised arm?
Robbo: Not too bad mate, she dusted me off with a loaf of bread after so he's held up alright.
Jack: Fuck, my bruised arm's causing a bit of grief this morning. Might toss one off to settle things down.