Top definition
To use sound instead of light to set one's urine trajectory with respect to a toilet.

The sound of urine colliding with water is almost always the desired result, though collision with the side of the toilet bowl is usually acceptable as well.
Chad: "Hey dude, I need to take a piss, but the light in your bathroom is burnt and your seat's soaked with Brad vomit."
Lance: "Just sonar it brah. But if you misfire, consider your keg privileges permanently revoked."
by Mr. Cassidy Pace Rush April 08, 2008
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