A tattoo on a female's lower back - an acronym representing "mid section tattoo" or alternatively "money shot target".
"Dude, check out the MST on that chick! I'd hit that all night!"
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An extremely attractive female, as in "10 pounds of party in a 5 pound bag" (kg if you're metric).
"That girl is ridiculously hot!"
"10 in a 5, dude"
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