Just like the bird that sings at night, the action of nightingaling means to cough, talk, or make any other kind of interruptive sound in order to alter the mood, or in extreme (but far more common than expected) cases,
interrupt the sexual act of
that couple which is a bit too loud and a bit too close and you are just
trying to sleep.
Carlos : Sean! WTF? I was
in the middle of
something!
Sean: Well... I needed to sleep... so...
Carlos: You fuckin nightingaler! I HATE NIGHTINGALING
Sean: And she was my
best friend you know!
Carlos: LOL
Sean: Idiot....