"hand over the commas"
"we'll include yo mama, if you fuck with my commas" - Ice Cube
Also, synonym for period.
John: Yeah man I heard she was on her comma.
Jack: Wanna have sex when we get home from wally world?
Jill: I can't. I am on my comma today.
Girl #2: That's hot but damn girl, ain't you on your period?
Girl #1: Hell no hunny, that was two days ago! I'm on my comma now.
Girl #2: Well shit, that's a different story then. So what'd you do?
Girl #1: I took him home with me, what else?