A game originating with baby sitters in the north east in which fruit loops or similar O shaped cereal is poured into a toilet and young boys are instructed to aim for certain colors. An alternate method of toilet training.
"Aim for the red one Derek! Good job! You won Piss-o's today! Wait untill I tell your mom when she gets back from Italy."
by Savannah Jewels June 29, 2006
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aussie slang for "can of beer".

could also mean "cylindrical liquid holder full of urine"... but highly improbable.
"maaaate, fuckin killer, this tin o' piss!"

"oy Bazza, pass the fuckin tin o' piss, or i'll snap ya!"
by Henry (Jesus' home boy) September 22, 2004
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