A mullett is business in the front and party (or something else) in the back. Sideways Corona Mullett (or SCM) is when you work from home with business attire on the top and something not so business like on the bottom. It works for video conference calls as long as you do not get up.
Her: Aren't you working from home today? Why are you wearing pajama pants with a shirt and tie?
Him: Sideways Corona Mullett... no one is gonna see the pants.
Him: Why are you wearing sweats with your best blouse?
Her: SCM baby.
Him: We are cutting the laundry bill in half!