Top definition
The medical condition known by doctors as diarrhea which comes as a direct result of a late-night McRun.
Max: Holy shit Tim! We shouldn't have gone on that McRun last night!

Tim: What's the matter?

Max: That McRun gave me a NASTY case of the McRuns!!
by Maxwell Dope November 09, 2013
Get the mug
Get a the McRuns mug for your cat Manafort.