Someone who insists on referring to Tea Party activists as "teabaggers" because of the word's pre-existing sexual connotation. Derives from some TP sympathizers' response of inviting such persons to suck their 'nads.
You're never going to convince that guy to stop calling you a teabagger because he's a habitual nadsucker hoping to score.
a small beaver like creature that lives on your hip is called a nab. The sack that it lives in is the nabsack. (Nabs can only be picked up on a special x-ray)