What's an evap like or what does evap mean?

Question

I know it's a stupid question but still, I want to know.

Answer

Evaporation line. That can occur when a pregnancy test has been left around long enough for evaporation to take place and leave a thin greyish line that doesn't indicate a positive result x

Answer

I thinks it's a line on a pregnancy test that is really light or the line was there before and now it's not.