Slang for "celibate," aka, refraining from sexual activity.
Chad: Yo, when was the last time you hooked up with Becca?
Brad: I dunno, like a month maybe?
Chad: Daaaamn bruh, maybe she went celly.
Meaning 1: A prison cell
Meaning 2: Cell phone
Meaning 1:
“Yo dude did you hear josh got thrown in a celly?”
Meaning 2:
“Hey bro, can I borrow your celly?”