A hitchhiker is an individual who travels the universe without the use of a ship of their own. Popular hitchhikers are Arthur Dent and Ford Prefect. Contrary to popular belief, Zaphod Beeblebrox is not technically a hitchhiker because he owns a ship which he has stolen (see: heart of gold)

Also, it is a common misconception that a hitchhiker is someone who knows where his towel is. This fact is only true to froody (cool and together) hitchhikers, giving rise to the popular expression "that frood really knows where his towel is". Arthur Dent and Tricia McMillan are two examples of "froody" hitchhikers

Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.

One who knows where his or her towel is.

A being, human or otherwise, that randomly asks strangers for rides in transportation devices when in need of such a service. Their destination can vary, parts of the galaxy, parts of America, the important places mostly. Most are fearless, yet stupid and reckless.

one whose primary mode of travel is hitchhiking, or (usually free) rides from motorists on the highway

Someone who knows where their towel is.

A combination of The Lonely Trucker and The Stranger, a hitchhiker is when a man sits on his arm until it becomes numb, then slaps his ham while driving.