When you say something is a "piece of cake," it means it is very easy to do.
In the 19th and early 20th centuries, African Americans started "cake walks." They walked or danced around a cake in pairs, and the best couple won the cake. This is how the idioms "cake walk" and "piece of cake" came about -- both meaning that something is very easy to do.
A: Hey! How did you do on the exam?
B: I got an A. The exam was a piece of cake.
by TKrattlesnake January 19, 2015
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Something that's really easy doing
We played against a child. It was piece of cake!
by vnrc October 25, 2013
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When something is exceptionally easy. Originated from slaves doing a dance called "cakewalking," a dance to imitate ballroom dancing, made to look effortless. Slave owners would sometimes reward the best performer with a piece of hoecake.
"He makes that dance look like a piece of cake."
by KiwiVanilaXtract September 18, 2007
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Dude 1: All right, I need to farm 25K honor today.
Dude 2: Piece of cake.
Dude 1: Huh?
Dude 2: We allways cap 3 flags before the first 7 minutes (World of Warcraft).

For the Horde!
by For the Horde January 17, 2008
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An easy task that usually ends up being more fun than difficult.
Mom: Mop the floor, please, son.

Son: Mop the floor, eh? Piece of cake!

Mom: What?

Son: I said that mopping the floor will be a piece of cake.

Mom: Oh, OK. I didn't hear you the first time.

Son: Understood.
by Diggity Monkeez February 21, 2005
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