Top definition
The greasy, phlegmy feeling one experiences not while eating McDonalds, but immediately after finishing. Typically first noticed in the parking lot. Usually accompanied with mild nausea.
Walking out to my car, I noticed the McDonalds Phlegm kicking in. Ghaack!
by Austinminnesotan March 11, 2015
Get the mug
Get a mcdonalds phlegm mug for your father Bob.