When two people poop back and forth into one another's ass holes.
My girlfriend and I did a Mexican Christmas last night, and now I have the shits and can't tell if it's hers or mine.
by Matthias Brown October 17, 2010
When two men with real sleazy spic 'staches hook up, and instead of finishing off on/in eachother, they cum on someone's Christmas presents. It's a once a year event. Quite the spectacle if you're ever lucky enough to see one.
Hey sis, I think I can hear Dad and Santa Clause having a Mexican Christmas tonight on Christmas Eve!.... Nevermind, it's just Dad and Little Timmy... again...
by Hipster H March 31, 2011