The literal meaning of neta (NEH-tah) is net, i.e. what is left after what must be subtracted has been subtracted. It has several meanings, all equally relevant and deep.
La Neta (with capital "N") is the ultimate truth or something that produces the same bliss. For instance, estos tamales son la Neta (these tamales are making me bliss out). When used without capital "N", neta means truth and neto means truthful or truthfully. For instance, me dijo la neta (she told me the thruth), and ¿neto? (are you serious?). Echar netas means to get into an open discussion of one's feelings, usually with the help of liquor.
La Neta es chida, pero inalcanzable (the Neta is cool but unreachable) was one of the tenets of the youngboys in "Y tu mama tambien".