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1.
Sexual intercourse.
They did the deed last night.
by karoline* February 19, 2009
 
2.
A dirty, sexual act. The deed is not necessarily intercourse, though it is often taken that way.

Similar to "it."
Did you do the deed yet?

I heard they did the deed last night.
by langlanglang December 01, 2010
 
3.
having sex for the first time
i did 'the deed'the other day
by robert March 25, 2005