It appears to be the utility knife of the spanish language.
Good question... it's a word i use without thinking about it... but perhaps i have more opportunities now that i read a little
from merriam webster
Main Entry: 1ya
Function: adverb
Language: Spanish
1 : already <ya terminó : she's finished already>
2 : now, right now <ˇhazlo ya! : do it now!> <ya mismo : right away>
3 : later, soon <ya iremos : we'll go later on>
4 : no longer, anymore <ya no fuma : he no longer smokes>
5 (used for emphasis) <ˇya lo sé! : I know!> <ya lo creo : of course>
6 no ya : not only <no ya lloran sino gritan : they're not only crying but screaming>
7 ya que : now that, since <ya que sabe la verdad : now that she knows the truth>
Main Entry: 2ya
Function: conjunction
Language: Spanish
ya…ya : whether…or, first…then <ya le gusta, ya no : first he likes it, then he doesn't>
other uses
8 desde ya : right now, immediately
and one i haven't heard (or noticed) here in DR
Main Entry: chole
Function: interjection
Language: Spanish
Mexico, familiar
ˇya chole! : enough!, cut it out!
Sample usage: "Ya, toy lito!"
