Used to describe the penis of a man by the name of Thomas, also known as Tommy. The penis of a Thomas is abnormally large, and often mistaken for an extra limb. This gives the appearance of three legs, resembling a tripod stand for a camera.
Damn, look Thomas S. over there. I fantasize about him in bed. I've heard he has a tommy tripod!

Thomas looks like he would have a tommy tripod, but in reality he has the smallest dick to mankind.
by CONTRABANDAZALEA January 8, 2018
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