Toilet Mouth 

'Tis when you urinate in your partner's mouth while recieving oral sex.

I was totally Toilet Mouthing this chick Devyn last night.

Toilet Mouth by Squidwardeeeward December 11, 2008

Back-mouth 

To talk back to someone while being a smart ass. Something an old fashoned grandma would say, along the lines of "Dont sass me"

Christian was very hateful on the phone with the nurse, so she yelled "Dont back-mouth me!" and hung up on him.

Back-mouth by strawberry0666 May 29, 2007

south-mouth 

A euphemism for a vagina.

not only did i get a bj, i also got to bang her south-mouth.

south-mouth by Rahl07 June 1, 2014

hold your mouth

shut up, stop speaking

ehh blud your giving me a headache hold yur mouf

hold your mouth by Fatoma February 8, 2005

Lying on your mouth

Lying about giving/receiving oral sex to/from someone, which includes sucking dick, eating pussy, licking ass, etc.

WOMAN: You know that girl said you ate her out. But, I knew she's lying on your mouth because you was home the whole time.

MAN: When you see that chick again, have her come to my office. She's gonna answer to me for that.

Lying on your mouth by Mr. Terrence L. Trezvant January 30, 2007

In my mouth

When you want to say something but it won't come out

My answer is just so in my mouth

In my mouth by $hane18 January 25, 2018

diarrhea of the mouth 

Talking too much, usually about something unimportant.

Susie has diarrhea of the mouth.

diarrhea of the mouth by Shawn B. April 14, 2003