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According to the Klingon Language Institute, Hab SoSlI' Quch! is a rather vile insult, which translates to "Your mother has a smooth forehead!" 

The other choices in our quiz do translate more happily to "Merry Christmas."

Jwaye Nowel: Hatian Creole
Nadolig Llawen: Welsh
Merry Keshmish: Navaho
God Jul: Norwegian
Mele Kalikimaka: Hawaiian

To say "Merry Christmas" to a Klingon friend, say "QISmaS Quch Daghajjaj." (If the references to "Klingon" elude you, please consult your nearest Star Trek fan.)

For more translations of "Merry Christmas," see the Santa's Net Web site.