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Origins unknown; used as a codeword to describe people hooking up; now used as common slang in (mostly the north of) Scotland to describe any kind of sexual activity, and indeed many other activities which have little or nothing to do with sex, and is generally used to indicate that something fortunate has occurred. It can be used as a legitimate verb in regular conversation, but it is normally just shouted, and is accompanied by a hand action where one puts the thumb and middle finger together, and taps them with the index finger.
Chris and Eleanor start making out at a party.

Chris's friends: "PIECING!"

--

Chris and Eleanor start making out in a library or a similarly quiet/awkward situation.

Chris's friends: -hand action-

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Chris: I got the new Call of Duty!

Chris's friends: "PIECING!" -hand action-

--

Chris: I pieced four girls last night!
piecing by Gregasm November 11, 2009
similar to bombing (large, elaborate, artistic pieces of graffiti)
piecing by Anonymous August 28, 2003

Puzzle Piecing 

When a man and a woman have sexual intercourse via penis and vagina. Referenced from puzzle piece being called male and female parts.
Puzzle Piecing by Heck Anus March 2, 2021
"Hey, did you know he was piecing Marissa?"
piecing by kram-pooh March 1, 2004

piecing the parakeet 

to shove a well sized parakeet up your anal hole while eating reeses pieces. this is mostly used during raving time.
i was piecing the parakeet with John last night.
piecing the parakeet by Kacissa September 26, 2008
piecing by RED December 4, 2002