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1.
a greco-roman wrestling move, originating from southwest florida, in which one grappler penetrates the other's asspipe with his thumb
throw in the thumblock!!
by Chuck Blonde December 12, 2007
 
2.
When having a girl bent over and fucking her in the pussy you shove your thumb in her ass and hook it so you can hold on and she can't get away.
I thumb locked my girlfriend and she loved it.
by joemomma69 March 25, 2011