The act of masturbating to pornography behind someone else who has no idea you are there.
Tommy was spanking it to Assaconda, not knowing Chuck was behind him, piggybacking.
by JohnnyInterwebs June 25, 2010
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When someone joins a friends cell phone family plan just cause it would be cheaper than being on your own.
"yo dog you wana piggyback on my family plan it would make it cheaper for the both of us" "chea, then we can get the latest n greatest phones
by goodguys May 25, 2010
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The act of trying to get into a subway station without paying. The name originates from the method, in that someone will wait for another passenger to pay, and when the gates open, the other person will immediately walk in right behind them so the gates don't close immediately. This only works with fare gates that open and close automatically, and not turnstiles.

The word is believed to have originated in Boston, where the act became more common after the MBTA increased fare prices.
As I was going into the subway station today, someone bumped into me from behind. When I turned around, the transit cops were giving him a ticket for piggybacking.
by Mr. X-103 February 28, 2013
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sex with a plus-sized person in the doggy-style position
It was too hard to get her legs far enough apart, so piggybacking was the only option that would work.
by capethom February 21, 2011
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Latching onto a person more knowledgable of the locations of ass and the process of getting it.
I piggybacked off a guy last night and he brought me to a great lay. Thanks guy.
by Jesse Adams October 18, 2004
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Taking advantage of the roommate dish-washing routine.

When your roommate has not yet washed their pot or pan, and it is still clean enough to swish water in and cook your own meal. You then leave it where you found it so they can wash it.

Only legitimate if the roommate is unaware of your use.
I've been piggybacking Sarah's pasta pot for a week, and it hasn't moved. I'm pretty sure we're just piggybacking each other at this point.
by HahaOwaitJustKidding March 8, 2011
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