To fuck somebody else in the ass, usually without warning. Can be used both literally and figuratively.
"Oops, I missed!!! Sorry, honey. Didn't mean to pull the greek sneak on ya."

"So I was bidding on this thing, thought I had it,... then some dude pulled a greek sneak on me and grabbed it at the last second!"
by Mr. Slinky October 20, 2005
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to perform sexual acts on the mother of a greek person while that person is out
sean greek sneaked chris' mom when he was at university
by Helen C February 19, 2004
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