Originally called DJ Only Records, SOUR Records was formed in 1993 by the Trinity crew as a creative outlet for the group of friends musical ideas. Initial releases were hip hop in style but soon the labels music evolved into the Jungle / Drum and Bass you hear today.
The opposite of sweet. Comes from the late 70's philosophy that all things in life are either simply sweet, or simply sour, or sweet and sour.
Preceded with "oh so" in extreme cases of sourness.
That was sour when it rained while we were playing golf.
Oh so sour, don't fart in the car!