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1.
Reggae term for disc jockey, literally the one who selects the music.
What the blood clot dis selector be playing da bati boy music!
by SSDwellah March 14, 2009
 
2.
In CSS, the XHTML tag that the formatting is applied to.
XHTML:
<selector>blah.</selector>

CSS:
selector {property: value}
by Pathoschild March 21, 2005