Y te has pintado la sonrisa de carmín
And you've painted on a lipstick smile
Caption 34, Disputas - La Extraña DamaPlay Caption
In the above clip you'll note that José Luis Perales sings "Y te has pintado la sonrisa de carmín". In this case carmín refers to lipstick, so the phrase translates as "And you've painted on a lipstick smile". Carmín can also refer to the color crimson (aka carmine), and sometimes to a type of wild rose. Lipstick, aside from carmín de labios, is also known as lápiz de labios. Bear it in mind next time you find some on the collar, yours or otherwise.
(Did you know that collar, in Spanish, is the same word as for neck: cuello?)
Here is another use of carmín in a song by the Argentine rock band Babsónicos.
Algo en tus labios color carmín
Something in your carmine lips
Sugiere que vayamos al grano
Suggests we get to the point
Captions 16-17, Babasónicos - RisaPlay Caption