Is it possible to get so thirsty that if water made contact with your skin your body would just suck it in?

Well... water repellent ...some what do to oils . But if your in plain water you lose water thats why your fingers and toes get wrinkly - water loss .
this is do to our bodys being salt water .

like osmosis? no, our bodies are water repellent. it what keeps your internal fluids inside and outside fluids outside.

i dont think so XD