When your farts get consistently more rank/putrid/vile during a short span in which you know they are going to be followed by a even more rank/putrid/vile shit, thus brewin’ gross.
Devon, can you please shit already? You’ve been brewin’ gross for the past hour.
A McDonald gross is when you get all you can out of a car deal even if it means burying used cars. For example bump a trade 3 grand over average book or take a set of wheels and don’t credit used cars.
“He’s so upside down I can’t get him done. Someone must have McDonald grossed him”