When the labia (better known as the outer lips of your vaginal region) show through your tight pants or spandex. it comes out in a V shape. The vagina is typically V shaped, which is ironic since the word Vagina starts with a "V." Coincidence? I think not!
A very aesthetically pleasing phenomenon, whereby a woman's venus mound is clearly discernable under the snug fabric of her lower garment. Typically, the fuller the labia, the more pleasing the effect. Tip: since sexual arousal causes increased blood flow to the genital region "toe" may be enhanced if she finds you desirable:)