The day where you have to pinch your shortest friend every time you see them.
Tall friend: Hey come over here! It's December 13th

Short friend: Oh noooooo....
by Quack Quack Wonder Woman November 2, 2019
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The day you kiss your girlfriend/boyfriend or ask out your crush
The day I will kiss my girlfriend is December 13th
by Mah732 December 12, 2019
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December 13th is the day where sMeXy💕 people are born.. soo sLaP thEm iN tHe bAcKkk 😈
your birthday’s December 13th Emily? THeN u GeT a SlAp
by typical_addri November 14, 2019
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December 13th is slap your tall friend day!
"Ow, why did you slap me?"
It's December 13th and you're tall!"
by MyNextPolo December 8, 2020
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December 13th Natitonal Kiss your bsf day! :p
Girl 1: Hey its December 13th! *kiss*

Girl 2: ? What was that for??

Girl 1: Search December 13th on urban dictionary to find out!
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Me:*kicks*
Brandon: “ hey what was that for!”
Me: “it’s December 13th”
by dontkickme December 10, 2021
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Both males and females possess mammary glands. On this day the females attempt to milk their partners in order to commemorate the evolutionary destiny of our species.
Sonia: Paul! My nipples are worn and tired. For once my teets may rest in peace as it is December 13th and I will caress your manly mammary glands in my palm.

Paul: *facepalm*
by Paul'sHOTteets March 19, 2010
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