1)the sound a photon torpedo makes coming out of the Enterprise

2)the sound an explosive turd makes when jettisoned out of one's stink-bay
Holy Balls, I just p'twanked a pound of corn-log into the toilet.
by Buddy Lite December 18, 2005
Derived from the word p'twankyho. Similar meaning, but usually said with more "oomph".
-something has just occured (or not, as the case may be)
- "P'twank!"
by Cup-Sellithaine February 04, 2005

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