A phrase referring to sexual intercourse between a man and woman. Also could refer to the act of charging yourself. Think of when you plug something in, or charge it up, that's what is happening during sexual intercourse.
Be sure not to get electricuted!
Tim: "Last night, me and Jen charged all night long!"
Joe: "Yeah, I charged too....by myself."
Tina: "Did you Charge yo boi last night Jen?"
Jen: "My boi is charged!"