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The club one joins after having inserted his thumb into his wife or girlfriend's anus while have doggy style intercourse.
Dude, I joined the thumb club with this chick last night when I was pounding her doggy style.

I joined the thumb club with this girls last night. Check out my chocolate wedding ring. lt came with a corn kernel diamond.
by Dr. Brown finger November 09, 2013
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2
One is a member of Thumb Club having successfully Fingered but in place of a finger, using your thumb. Often designated by giving the "thumbs up" sign.
"Hey mang, I was hanging with my girl last night and I got into the Thumb Club!""
by Boognish Rising August 06, 2008
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