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1.
To the definition above. NO! HITCHHIKING IS NOT A GAY SEX ACT YOU RETARD!
Anyway, hitchhiking is the method of transport/lifestyle in which a person or group of people stand by a major motorway and wait for a free ride. It is risky but the likelihood of being raped and chopped into tiny bits is very small and overplayed by the fear-mongering media. In my opinion.
hitchhiking around the world is a noble goal but some countries are far too dangerous for an american
by Hoyrakor the Bloodghast July 24, 2008
 
2.
The action of thumbing a person either in their anal cavity, or the vaginal cavity.
"Mike R: Haha look, it looks like i've been thumbing Sally when she's on her blob.
Mike C: That's not what it looks like...
Mike R: DUDE...
Mike C: Sally got Hitch hiked.
Mike R: HITCH HIKED!?
Mike C: It's when you thumb some one, instead of fingering them.



Mike R: Wanna go Hitch hiking...?"
by Clarkem July 24, 2008
 
3.
when doing a girl doggstyle, the gentleman inserts his thumb in said girl's butthole
She loves hitchhiking, though I always need to wash my hands afterwards.
by BaroqueBill March 22, 2010
 
4.
when a dude is thinking of another dude while sticking his thumb up his ass.
i was hitchhiking in the shower.
by locksmith April 02, 2008