What is Devil's Mouthwash?
1.
Any type of alcoholic drink.
Beer, Liquor, etc.
That man got into an accident because he was drunk while driving. He must have had some of that
Devil's Mouthwash .
See 
2.
When a girl gets a mouthful of cum
Susie got a mouthful of the devil's mouthwash last nite at the movies.
See 
Random Words:
1. 
when you fall over in dramatic fashion
i fell arse over elbows, did you see it happen,
See arse, fall, fell..