invisinips
When a person's nipples are the same color as their skin. The nipples are said to look almost invisible.
I think she flashed me, she must have invisinips
invisinips
When a girl has clear(skin colored) nipples that remain invisible(do not stick out like normal nipples) until licked, sucked or otherwise excited.
"Dam Felicia has invisinips, i had to lick the center of the boob before they appeared"