A girl who sometimes doesn't think before she does things and is very sorry and wishes she had a time machine, but doesn't have bad intentions, and when given the chance tries to be the best girlfriend ever because she is crazy about her man.
Weasel lips made a joke that her man got really mad about and now she is trying to fix it.
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A mustache.
Female Usage: "Too bad Hillary has such dark hair. You can see her lip weasel."
Male Usage: "Goodness, that's quite an elaborate lip weasel you're sporting. Have you ever been tempted to just shave it off?"