Privacy is on the door
But still they can hear you screaming more

from R. Kelly – Ignition (Remix) Lyrics on Rap Genius

Meaning

R. Kelly makes reference to going to or being at a hotel in verses 1 and 3, so this is referring to a “privacy please” or “do not disturb” sign hung on doorknob of his hotel room entrance

Though if he was in a hurry it’s possible he just used something like this:

Either way it doesn’t really matter because the girl he’s with is a screamer.

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