A Bikie is somebody who rides a Harley Davidson or a Cruiser style Bike. Bikies are Generally members of a Bikie Gang.

A Bikie is different from a Biker who is someone who rides any kind of bike. Also termed as a motorcyclist but such a name is generally thought of as uncool.

when you're hungover as shit after a spending a night drunk as a skunk

Any time a bicycle is used with the seat removed or with part of, or all of the seat inside the riders anus.

Bikie is an Australian slang word for bike gangs, which are organized criminals that normally ride cruiser style motorcycles to show off with loud pipes and redicilous modification to bikes.