Rusty Bumper 

When the drunk redman man (generally named Tanto) tries to slip his third mocassin into your turd cutter and ends up just dick punching your fart box. It is called the rusty bumper due to the uniquely rusty color that a redman's dong exhibits.

God damn Tanto was so drunk last night he kept giving me the rusty bumper.

Rusty Bumper by Strangler Hunter July 24, 2019

Rusty Bumper 

(n). A feces latent anus sighting during the action of sex.
(n). A person's ass you might think to be rather dirty. A dirty ass.

I was having sex with this girl and when I flipped her over she had a rusty bumper.

I bet that girl has a rusty bumper.

Rusty Bumper by Andy and the Rad April 20, 2009

rusty bumper 

When you have anal sex right after someone takes a shit and doesnt wipe.

My girlfriend just took a shit but she was so horny she let me have her rusty bumper.

rusty bumper by bryceb476 April 7, 2015

rusty bumper 

When you're having sex, you shit in your hand and smear it across the buttocks of your partner, and proceed to hump aggressively.

David pulled a fucking rusty bumper on Max, and he didn't even see it coming!

rusty bumper by club210 May 7, 2009