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"Pop Wood", "Popped Wood" or "Popping Wood" refers being happy or joy-filled. One of the simple pleasures of youth was running through the forest (or any wooded area) and blissfully hopping over the logs, branches and sticks that were strewn about. That term reflects back to and is a remembrance of that purest of joy.
I pop wood everytime I get to visit with my grandkids.

When I saw how beautiful my daughter was on her wedding day, I popped wood.
by Shapper September 06, 2010
Get a hard-on; achieve an erection
"I'd hate to pop wood in these tight pants...show up like u wouldn't believe"
by brook July 25, 2004