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
The best hitchhikers have all seen the restaraunt at the end of the universe.
by Jonathan May 31, 2005
One who knows where his or her towel is.
Ford Prefect is one hell of a hitchhiker; he knows where his towel is. What a cool frood.
by cyenu February 4, 2005
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.
by D4A3F2M1H9 June 13, 2010
Someone who knows where their towel is.
That Ford Prefect is one hell of a hitchhiker; he knows where his towel is.
by cyenu January 29, 2005
Immediately following the act of anal sex. One discovers fecal matter on the tip of one's penis.
Dude!! While fucking Stacy in her poop shoot I picked up a hitchhiker!!
by Skippyandpete November 5, 2020
Hitchhiker:

To masturbate while your hand is numb, to give the sensation that someone else is pleasuring you, while driving a vehicle.
On the way home from work last night I grabbed myself a quick hitchhiker
by Ryedawg II September 21, 2009
A thumb in either the anal or vaginal orifice while in the doggiestyle position.
I might have married the bitch if she had been down with the hitchhiker.
by John Clever March 20, 2003