Thumb Plumb 

When a person jams their finger in their butt hole to prevent diarrhea from spilling into their pants

-Dude, is that guy scratching his ass in class?

-Naw man, that guy's doing a Thumb Plumb

Thumb Plumb by James Rox Sox January 29, 2009

Thumb Plumb 

A thumb plumb is when there is a lump of shit left on the thumb after thumbing an arse.

Holy shit, you should have seen the size of the thumb plumb she left.

Thumb Plumb by Biggaybear April 2, 2013

plum thumb 

this is the purple/brown like color your thumb turns into after over exerting it into someone's anus (including your own), causing it to slightly become bruised also

Dude, can I borrow your gloves for today? me and Neil were playing hitchhiker sex all night and now I got Plum Thumb from it being up his ass for so long....

plum thumb by 777geez November 20, 2015

Thumb in the plum 

While having Doggystyle sex with your significant other you place your thumb in her asshole. There for placing "The Thumb in the Plum."

Jill was riding my ass all day about the chores I hadn't gotten to yet, so when we had sex later that night I put "The thumb in the plum."

Thumb in the plum by Broadway Harmier December 24, 2021