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2.
251
area code of lower alabama. main city is mobile
we be's in da 251.
by 251 whodi July 13, 2003
 
1.
251
The fundemental jazz chord progression. Taken from II-V-I, or more descriptively, IIm7-V7-IM7
An example of a 251 progression in the key of C major is: Dmin7 (2 or II is 2nd scale degree of C) G7 (G is 5 or V scale degree of C) Cmaj7
by kwajazz July 24, 2006
 
3.
251
To be Chill.

Derived from the chord progression used often in jazz to end a phrase or song or to lead into a new segment.
"Hey man, how are ya?"
"Fine, pretty 251"
by Jazzy_Joe May 11, 2009