An alternative name for a shovel.
The name derives from the fact that Mexicans in the USA often do laborious jobs requiring use of a shovel. Like construction, gardening, road building, or farming.
Why?
A) Many
Americans are too fuckin'
lazy/fat to do
said jobs.
B) The aforementioned Mexicans are (most likely) illegal immigrants.
"Dude, I'm exhausted. I spent all day on the bad end of a
Mexican Torture Stick."
"Amigo sure can work that
Mexican Torture Stick!"
"Some crackhead tried to rob me, so I whacked him on the head with a
Mexican Torture Stick."