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1.
When you gotta take a poo so bad but you aren't anywhere near a legitamate place to go so you hold it in for an hour until you finally get to a toilet and by this time you can hardly wait to get your pants down when it just blows out your ass, and everyone else around you knows exactly what you just did.
Man, they had to repair that toilet in the public 'room after I took that sonic dump last week. I still can't look at Jesse straight after he took one a few months back while I was in with him.
by anonymous December 30, 2004
 
2.
when you take a dump that is so loud and intense you end up with hearing loss or other ear damages.
I took a sonic dump last month and i still cant hear anything out of my right ear!!!
by noshelter September 15, 2004