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I’m still a novice/terrible fisherman, so I don’t know all the correct terms but I’ll try to explain. A snap is what connects your line to your lure. [Here’s a picture of the opposite side of what she’s wearing in her ear](http://image.dhgate.com/albu_206053395_00/1.0×0.jpg). The top eyelet unfastens from its clasp, then you put it through the eyelet on a lure. The bottom eyelet is what you tie your line to. It allows you to quickly change your lure.
The snap she’s wearing is a swivel snap with two eyelets at the bottom. One is for the line, one is for either a float (you know, those little red and white floating balls) or a lead sinker. Looks like there are more experienced fishermen responding in this thread so maybe they can correct me if I used the wrong terms.
The problem with her statement is that there’s no possible way she could know if it was used for live bait, so it sounds kind of pretentious.