Farting and Coughing at the same time to mask the sound of the fart.
Rob is watching TV and he didn't want to fart in-front of his newly acquired Girlfriend but he really needed to so he Coughboffed. Coughing whilst farting.
Jill could still smell it though. It's not quite perfected yet.
Falling over then acting like you meant to do it.
Jill is walking across the road.. then trips and fall.. and pretends she meant to do it.
Rob is looking and thinks to himself "She totally just Skartdiggled" WIn