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1.
A hammer. Usually the bigger, the better.
A tool (claw hammer, ball peen) that can disassemble something a lot faster than a conventional wrench.
Man, I can't get this thing loose. Pass me the mexican speedwrench.
by abacus November 18, 2004
 
2.
In its most literal form, any member of the wrench family featuring a screw-adjustable aperture, allowing one wrench to fit any sized nut or bolt. While not the ideal tool for the job, the mexican speed wrench is the fastest.
Is that bolt there a 15mm or 16mm? Ah, fuck it. Hand me the mexican speed wrench.
by dbbartender October 01, 2006