An std that you can only get if you have red hair, freckles and have recently kissed someone who has been sucking on a filthy penis. Common symptoms include: Migraines, yellow hands, a common cold and the urge to yell homosexual things when you are angry. There is a very rare disease and only one case has ever been recorded.
"Dammit Brendan don't come near me, you have dick mouth."
"Heard you got dick mouth after hooking up with that chick last night Brendan."
"Damn Brendan, you should really get those yellow hands checked out, you might have dick mouth."