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1.
the opposite of one upping someone, trying to match a complaint with and even worse grievance.
Person A: I don't think I did to well on this test!
Person B: Well, at least you studied. I didn't even know we had a test today.
Person A: Why are you always trying to one down me, let me have my moment.
by aly_xandra April 26, 2007
 
2.
to be less Jewish than one's parents
"Shmuel's parents were good Conservatives, but he one-downed them and only goes to service on High Holy Days."
"Oy vey!"
by Yussel Greenberg May 05, 2010
 
3.
slang for good bye also see one
usually used on communication devices
Poopy: yo ima hit u when i get back to the block iight...one down
Dae Dae: one down my nig
by Rdurbin September 05, 2005