Weird green wiggly creature on bathroom wall?

My sister just called me into the bathroom,it's like half 2 am,&she like points to this weird green,wiggly insect. I thought it was like a lump of toothpaste first,cause it was like curled. Anyways,it left behind like a white bit of discharge,&it just wiggled and twisted alot. I wrapped it in some tissue and killed it,&it sort of felt like it mushed in the tissue?what could this be?!

Please tell me!