When a girl wears a short skirt and tights and the bit on the tights where the two legs join is on show. This can happen when a girl in a miniskirt bends down, or her tights are too big/small. It is very unattractive, and takes away the effect of the miniskirt.
*Top of tights is on show*
Girl One: Ew, that girl is doing a shivee.
Girl Two: Gross.
*Very short skirt*
Girl 1: Hey, am I doing a shivee?
Girl 2: No, you're fine.