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2.
A Baltimore based interrogative colloquialism short for "Did you eat?"
"Jeat at that new all-you-can eat crab joint near Fort McHenry?"

Or much simpler:

"Jeat yet?"
by T. Scott G March 24, 2007
 
1.
Short for, "Did you eat?"
Boy, I'm hungry. What about you, jeat yet?
by David J. June 29, 2005