When a woman's vagina gets wet from instantly getting aroused. Whether it be from the sight of someone extremely good looking or she is just suddenly horny. The female equivalent of the male boner.
"He is so sexy. Every time I see him I instantly get juiced up."
"The other night I came home and he was doing the dishes. Just the sight of it got me all juiced up."
Jessica: Omg bruh I am slick not ready for this date, I need you to juice me up.
Chase: Baby girl I got you. You is kind, you is smart, you is important. You don’t need no man, but any man would be lucky to have a boss a$$ b*tch like you.