A window that really fucking pisses you off just because it's a window. Often used to describe a cunt-like window or a person or thing which annoys you just as much as a shitty window.
Tom: Hey mark, that Bill guy really is a cuntwindow!
Justin: I know right! Now he is a real cuntwindow if ever I've seen a cuntwindow.
1) Used Tampon. Because of the string's resemblance to a candle wick, and where it has been.
2) An extra strong word to use to describe or call someone who you hate.
1) "Gross, some lady missed the trash bin and left her CUNTWICK on the floor."
2) "Dammit! Some CUNTWICK backed into my car and didn't leave a note!"