a threesome were a chick is on her hands and knees one dude doing doggy while the other cops head and they join hands over the top on her to form the sydney harbour bridge
mate this back packer bitch was on her hands and knees i was doing her doggy while bazz was copping head we were going this bitch something vicious then we decided to join hands over her and show her the harbour bridge.
Originated from a Shaw commercial. A fun way to ask for a hug. You open your arms up as if to let someone come in for a hug (this shape resembles the shape of a harbour), and then you use the phrase.