When someone coughs and lets out a fart either accidentally or strategically at the same time.

When someone serendipitously farts while coughing and the cough masks the sound of the fart.

When someone coughs to hide a fart with devious intent.
As I was laying in bed I coughed and farted at the same time, then I asked my boyfriend what he'd just heard. He said "I just heard you cough." I smiled and told him to take a deep breath and that I just laid a cough fart.
by SweetpeainSF December 2, 2010
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