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1.
Sexual relations instigated by a nerd or geek seeking to appear learned.
Nerd: "Hey beautiful, how about my go back to parent's basement and concatenate?"
Woman: "No."
by MF January 07, 2004
 
2.
the joining of two separate words in everyday life or in a spreadsheet formula.
=if(C7=1,0,concatenate C7,C9) where the cell C7 contains a word in the spreadsheet like good and the cell C9 contains a word like morning the result of the formula under certain circumstances would then be good-morning
by Sir Chris the nameless Knight December 18, 2012