Top Definition
One plus One can equal Three without protection.
Who says math doesn't apply to real life?
by The Ugly One February 28, 2004
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

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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