The gunk that builds around the mouth (mostly in the corners), of one who either has bad dry mouth, or who drank a large amount of white milk. The effect of mouth jam is usually followed by tooth slime(the stringy substance that hangs between one's upper and lower teeth as they speak)
Man, looks like you need some water you have some major mouth jam
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complimentary term for a kickin vagina.
Damn baby...yo shit was the best. You got sugar walls.
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