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....
by 777geez November 20, 2015
Get the plum thumb mug.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."
by Broadway Harmier December 24, 2021
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