Sometimes expressed in text as "HGGGGHGHHGHGHG", irl this sound communicates that the person is dying, inside or outside.

The cough that people having a crap in a toilet stall give to ensure you know they're in there.

When you get a bad cough the morning/day after performing felatio on a questionable woman.

Rolling on the floor laughing coughing, particularly common when taking massive gravity bong resin hits.

The winter cough that afflicts British folk, so called as it is both simultaneously serious enough to be nearly dying and needing antibiotics but simultaneously not bad enough to be COVID and in need of a PCR.

So called after Schrodinger's cat, a thought experiment in which a hypothetical cat may be considered simultaneously both alive and dead as a result of its fate being linked to a random subatomic event that may or may not occur.

Stall Cough: A sound made while sitting on a public toilet to let a newly entered patron know someone else is in the bathroom.

Refers to where you feel a cough coming on while your mouth is full of food/drink, and so you hastily down the entire mouthful so that your mouth and throat will be free to expel the cough "cleanly", rather than there being a humongous "geyser" of messy stuff to go flying all over the place and disgustingly splattering everything within a several-foot radius.