A thang-a-lang is the male genitalia, also known as the penis.
I just saw Hot Liza shake her thang-a-lang at the club last week.
by fattyMagik June 22, 2009
a long hair from someone head that has fallen into the butt crack and is stuck there. often happens in the shower, when washing hair it falls out and slides down into the butt.
i just pulled out a thangalang!
by roxy & margo November 12, 2010