Seekin  
(v.) A tool to attract the opposite (or same) sex when courting.
The actual sound is a fast, repitious kss-kss sound.

It's also used to attract attention in general, though, is use from male to male is rare and is considered a social faux pas because of its sexual inclinations. This, however, causes confusion and frustration if the seeker is a female trying to attract a male if she's out of his field of vision. The male will almost never respond for fear that the seeker is actually a male.
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