A gun that shoots BB pellets, and is highly desired by young children in the 1940s. It has a secondary purpose as a device with which to shoot your eye out.
Kid: I want a Red Ryder BB Gun!
Every adult within a 3km radius: You'll shoot your eye out, kid!
When a guy is laying on his back and a chick with a heavy period is riding on top of him, and a bit of the menstrual blood leaks out from her pussy all over his stomach and sheets.
Ric: Yeah, I took this bitchin' ass chick home last night but she didn't tell me she was raggin. She was fuckin me on top and the next thing I know...
Hamilton:... oh no, she didn't...
Ric: Yep, fucking red rider all over my sheets! Bitch!!!