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1.
the act of paying money to walk someone's llama.

sounds like prostitution but no, this is not a sexual reference of "walking someone's llama" but actually walking the animal.

hobby of some people

recreation at a Virginia mountain camp
let's go llama trekking.
by don't look behind you October 16, 2009
 
2.
Having sex with a series of hairy women, probably French or Eastern European
Totally went llama trekking the other week
by Llamatrekker1 March 09, 2010