When a person is charging someone,
the charger makes a move on their crush with the intent to gain attention from that person. This usually involves a lot of flirting and the goal is to have the feeling reciprocated by the chargee.
It is the precursor to hooking up/dating.
"Who does Jake like now?"
"He's definitely charging Natalie. Did you see the way he was all over her at that party?"
Short for sexually charged. Also means horny, aroused, wet. Basically it means that someone is ready for sex or really wants to have sex, or want to masturbate.
"I'm allcharged and ready to go!"
"I am so charged that I could just explode in my pants!"
"Dude, she was so charged, I couldn't get her off of me."