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1.
A knife one would carry every day.
Person 1: Dude, I dont have any cash for the boritos.

Person 2: No biggie, the clerk looks like a pussy. Here is my mexican credit card.
by MBisaBP1 January 02, 2006
 
2.
A siphon hose. Instead of paying for gas, simply help yourself to another motorist's fuel. Form of credit has disappeared with the advent of locking gas caps
"We're a bit strapped for cash for this cross country drive."

"That's ok, I've got a Mexican credit card in the trunk."
by leGrandFromage February 12, 2013