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A Slaughter Mouth can be a girl who loves to give blow jobs, or it can be another name for a blow job
Danny Mac: Wow, I was with that girl last night, she's quite the slaughter mouth. Gave me head alllll night long.

Rizzy Ryan: Yo I'm calling up nancy tonight for some slaughter mouth, she knows how to suck.
by Danny519Mac May 31, 2009
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