Top Definition
A more awesome alternative to the word "pooping". It's got the soft "sh" sound. The harsh "ack" sound. And the "ing" that shows it's an action.

Best. Word. Ever.
Guy - "So dude, I was shwacking earlier and..."
by ben8790 April 02, 2011
1 more definition
The act of showering, then masturbating.
After a Delicious Italian Dinner, I think I'm going to have myself a steamy session of Shwacking at home.
by Chassssjuam August 09, 2015

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