When a Downunder man with an average penis (6 inch) brags to a girl "I could give you 12 inches and make you bleed". Then sticks it in twice and punches her in the nose.
I was talking to this hot chick the other night, she was iffy about coming back to mine so I dropped the Wagga Wagga Footlong on her and made the bitch bleed.
A foot long at subway is a 12 inch sandwhich that people enjoy buying. This term however has been con notated with sex after the $5 foot long commercial which implies you can buy a foot long penis for $5