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1.
A person of dubious musical ability often heard interpreting contemporary songs by means of whistling, using a trill, or swiftly alternating up and down notes like a bird's song.

Trillers often use their powers for mischief, distracting peace-loving folk from legitimate business with their ridiculous outpourings.
Aah, I nearly sank the black until that triller started with the stupid whistling...!
by Noidie July 03, 2008
 
2.
A female who claims sexual neglect from her husband in order to manipulate sexual gratification from another male.
I really liked this gal, until it became apparent she was a triller.
by triller March 02, 2012