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It's the year 2011 in. Calum hood has it tattooed on his shoulder blade because that's the year 5 Seconds Of Summer Formed.
Oh 5SOS formed In MMXI
MMXI by Destinyalfakiss November 12, 2014
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The most boring year so far. This is only because I want to contradict with what the last guy said EXCACTLY a year ago.

Oh....... MMX1 means 2011......
MMXI means 2011, does it, umm..., umm... kill mee
MMXI by xi Sparked ix January 1, 2011

MMXI = 2011

MMXI IS roman numerals for 2011

M = 1000
X = 10
I = 1
OMG its MMXI already, MMX went so quick!

MMXI = 2011
MMXI = 2011 by fdunknow December 31, 2010
This is just 2012 written in Roman Numerals making it look so much more badass. This makes you also seem so much more intellectual than you actually are. Each "M" stands for 1000, the "X" stands for 10, and each "I" stands for 1 so 1000+1000+10+1+1=2012.
Hey man can you read this? I can. MMXII just means 2012, damn am I the only person that's smart enough to read this?
MMXII by D.kellz February 5, 2012
Roman for 2013. You are automatically an Intellectual bad-ass if you know it.
"Avate MMXIII" - Goodbye 2013

BBC World
- MMXIII -
MMXIII by NJInvincible December 28, 2013