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 6, 2010
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An alternate tuning for the guitar, CGCFAD as opposed to EADGBE. More commonly (and mistakenly) referred to as Drop C.

Many bands utilize this particular tuning, including, but not limited to, As I Lay Dying, Killswitch Engage, System of a Down, Children of Bodom, Lostprophets, Breaking Benjamin, Bullet For My Valentine, Rammstein, Atreyu, Senses Fail, From First To Last, Metallica, Norma Jean, Thrice, A7X, and The Red Jumpsuit Apparatus.
Bill: "Dude, I love how Atreyu plays all of their songs in Drop C!"
Bob: "No man, they play in Dropped D Tuned Down One Whole Step."
Bill: "Dude, that's a long ass name. Lets just call it Drop C."
Bob: "OK."
by jeauxzuf November 14, 2007
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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 5, 2005
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Joey, Bobby, and little Timmy sat out the kickball game and burnt one down behind the gym during recess.
by Nick D November 11, 2003
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Response to inquisitive greeting that denotes you're getting things done (as from a daily list of activities).
Ed: "What's up?"

Alan: "One down, dawg."
by lastofseven June 3, 2010
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To have a shit, especially if caught short and no conventional toilet is available necesitating that the said shit is delivered from a low height, such as in the woods.

Extendible however to any situation where a person has removed themself in order to defecate.
Where has your wife gone?

Oh, she has just gone to coil one down, she will back shortly.
by JLMW September 2, 2011
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