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1.
In terms of speaking like a teenage in the urban rap culture (brought on supposedly by the gang Blackstreet; See diggity) Piggity is the verbword of asking for a sample of something. This prase started in southern california used by mostly fans of underground rap.

Also a slang reference to a peice or pipe
"Can i have a piggity of your _____?"

"Dawg lemme get a piggity of that diggity dankness!"

"A PIGGITY IS ALL I ASK OF YOU BRO!"

"Yo bitch i want a piggity of that snatch!"

"the popo smashed my piggity..."

"I forgot to bring my piggity, fool."
by Buddawg April 17, 2007