Reproduction joke. The "1+1" refers to two people having sex; the extra 1 represents a potential baby, making a total of 3 people.
"I'm gonna get laid tonight!"
"Whatever man, just remember sometimes 1+1=3."
by progamer124 January 04, 2005
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Pregnant.

Like one guy and one girl=one guy and one girl and one baby.
So, what happened last night?

Well: 1+1=3.
by youmeatsixfanatic February 03, 2011
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A disorder of the mind that comes from drinking Pepsi in the wee hours of the morn, which normally results in:
Burping through your nose
Laughing repeatedly for 15 minutes straight
Making strange sound effects
Licking phones and frog Beanie Babies when Orlando Bloom is sighted on the TV Guide Channel.
Lennon and I had a 2+1+1=3 this morning that lasted for an hour or more.
by Nicole McGalliard July 07, 2004
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A demented way of interacting, insanity, sleep deprived, usually witnessed while coming home from Forensics tournaments. Must have two people in order to accomplish this state, and they will usually be of opposite genders.
I saw Eileen and Brandon having 2+1+1=3 today.
by Josh Wallen December 19, 2003
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It's a new-fresh way of thinking. Socially liberal, socially pissed-off, and fiscally conservative. F*ck off, but I love you, and I want government out of our lives as much as possible.
I'm the New Republican. That's how I doos it, in three parts; 1/3 hippie, 1/3 punk, 1/3 republican.
by MPCopeland June 16, 2011
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its a way of writing the number "127'
these arent random
some of you might notice a pattern
1+1 is 2 so you do
1+1+2 which is 4
1+1+2+4 = 8
1+1+2+4+8 + 16

when you get to 16 break it down to single digit and add them seperately so
1+1+2+4+"1+6"
you will get 23 so

1 + 1 + 2 + 4 + 8 + 1 + 6 + "2 + 3"
repeat
i suck at explaining things
did you know 1+1+2+4+8+1+6+2+3+2+8+3+8+4+9+6+2+7+0+7+7+9+1+1+0+1+1+3+1+7+1+1+5+1+2+2 is a way of writing 127
by cosmnik June 07, 2021
Get the 1+1+2+4+8+1+6+2+3+2+8+3+8+4+9+6+2+7+0+7+7+9+1+1+0+1+1+3+1+7+1+1+5+1+2+2 neck gaiter and mug.