A man puts his soft penis in a glass bottle (preferably Corona), gets it erect, then cracks the bottle over a hard surface. The surfaces may include anything from curbs to a woman's head.
Miguel: "Yo Rico, what did you do for Cinco de Mayo?"
Rico: "Aye B, we made some Mexican firecrackers and lit 'em up GOOD! My dick still hurts!"

John blindfolded me and said I should do a Mexican firecracker. 5 minutes later, I had glass shrapnel in my balls.

by Nah B Nah July 6, 2006
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You turn into a Mexican Firecracker when you eat something that makes you sick and you end up shitting and vomiting (and probably praying for a quick death) at the same time...food most likely eaten in Mexico...
Dude, I ate some street tacos last night and they turned me into a Mexican Firecracker...
by EnormousGreenRageMonster September 28, 2019
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