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The erotic fascination (more commonly in males) with female twins; particularly of the more aesthetically pleasing category.

i.e: t.i.l.f's

scenario: come on now, do you really need me to describe it for you?....ok, fine

if every time you see two twin chicks walking together your mind goes straight into the gutter, you my friend have Geminitis.
by Logan Cain January 04, 2008
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