Top definition
This occurs every year on the 16th July.
This is the day when you change your font on your instant messenger such as msn or yahoo etc...
Dude 1: Dude change your font its so boring!

Dude 2: No I like it

Dude 1: Dude but it's National Change your Font Day

Dude 2: Oh really alright then I have to change my font!
by Stevey E July 16, 2007
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