An off brand, damaged, or expired condom that you would not feel safe using for sex but could still be used to jerk off into.
Man: Did you bang Amie last night or what, dude?
Dude: Hell yeah, I tore that pussy up. I was all out of condoms though so I had to grab one from your drawer.
Man: Shit, you'd better buy that slut some plan B and get your dick tested...the only thing in that drawer were jerk off condoms.