I'm listening to the podcast "Over the Drive". Its second episode (transcript found here) starts with the question "When you picture a truck driver what comes to mind?":
When you picture a truck driver what comes to mind? A booted, bearded Bubba with one those caps that says, Peterbilt? Or my personal favorite, those pearl-snapped plaid-shirted prodigies who were big riggin’ before they could even shave.
I don't understand the meaning of rigging here. Cambridge Dictionary tells me it means "the act of arranging dishonestly for the result of something, for example an election, to be changed" or "the ropes that hold and control the sails on a boat or ship". Neither of them seems to make sense in the context.
I also looked up in Urban Dictionary but I didn't find a good explanation there, either.
The podcast was made in the United States so I think "riggin'" here is used in the context of American English.
Anyone can help me?