to have sex with 2 or more of a girlfriend's sisters, or a friend's current girlfriend
i seen michelle last night, you know steves girlfriend, and totaly pulled a jon boy
by jon boy July 16, 2006
colloquial Australian slang for a Rent Boy or someone who has partaken in a few to many disco biscuits and lost the rock.
"Jon boy mate, I remember when you were Jon Boy Rock......get off the pingers!"
by JB LOST THE R May 03, 2010