Rusty finger 

Brown tint of fecal matter found on the tip of your finger after itching or playing with your anus. This is most commonly observed and then sniffed.

After a short jog, Jimmy reached down his sweats and scratched his anus. When he pulled his hand back up, he had a rusty finger, then sniffed it.

Rusty finger by Robbbbbbbbbbbbbb March 14, 2009

rusty finger brush 

The art of fingering your butthole and then using your rusty finger to brush someones teeth. - Jim Williams

My wife loves my rusty finger brush. The rustier the better.

rusty finger brush by loverofallthingsrusty September 20, 2015

Rusty Finger Puppet 

Like a rusty trombone, but somewhat straighter. Performing anilingus on your woman whilst diddling her vaginal canal. Classy move, and lets her know hepatitis ain't no thing.

Although I enjoyed that Rusty Finger Puppet last night, you might want to get a blood test.

Rusty Finger Puppet by TrevtrevO May 28, 2010