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1.
That chaffing you get around your mouth after a night of making out. Can get much worse if one person has a mustache.
Person A "Ummm... Why do you have a red rash all around your mouth??"
Person B "It's all right... I just have make out mouth"
by tommiecat October 17, 2010
 
2.
The swollen mouth one gets after making out with someone for too long
Dude, your lips are so red.

Yeah, pardon the makeout mouth, I was making out with this really hot guy for ages last night
by x-files geek December 30, 2008