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1.
A Picerno involves ultimate relaxation and rest. A true Picerno will fall into one of the following categories:

-Sleeping for more than 11 hours straight
-Any nap over three hours
-Falling asleep while sitting up

For one to really enjoy their Picerno it is recommended that they wear mesh shorts without any underpants.
"Dude, I worked all night, time to take a Picerno"

"We were watching the Patriots game and Jud took a Picerno while on the couch"
by kickazz#9 March 09, 2009
 
2.
The act of running out of your house in pink boxer shorts, in a flustered manner.
I looked out my window and saw my neighboor doing a picerno.
by Liverman September 04, 2008