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1.
If a woman wears a thumb ring on her right thumb, she is considered to be Bisexual or Lesbian
Just check out pictures of the most famous lesbian, Melissa Ethridge. Her thumb ring is always on her right thumb
by Ksplash July 08, 2006
 
2.
The most heterosexual digit on which to wear a ring.
Arnie: vut do you sink of my thaaarmring Sly?
Sly: *unintelligable mumbling* thumbring *more mumbling*
Arnie: Ya, I agree, it ist very maaasculine.
by Grae November 12, 2005
 
3.
A homosexual advertisement for men. When a guy wears a thumb ring, he is open and willing to engage in anal sex, rimming, reach-arounds, and all glory hole activities.
"Do you have any thumb rings for sale?"

"I'm sorry, but we are all sold out after the PRIDE parade last week"
by Snyper1d March 28, 2014
 
4.
If a woman has a thumb ring she is tramp ... Willing to have casual sex with just about anyone ..... If you see a woman with a thumb ring buy her a beer and see the magic work

The trampiness is multiplied by the amount of thumb rings she has on !!!!!
Hey bill ... Check out that chic with the thumb ring ..... I think I'll buy her a beer ..... I'll see you tomorrow !!!!!!
by big joe 77 March 19, 2013
 
5.
When a ring is worn on your thumb it advertises your willingness to engage in anal sex. Like white pants it transcends the boundaries of gender and sexual orientation.
Kevin: "Hey Lisa May! Whats with your thumb ring?"
Lisa: "I'm hoping to find a willing guy at the bar to give bbatm"
by Panic! InMyPants September 17, 2008