What's wrong with my cat?

Heeyss i have a cat name Kobe. he is a year old and is an inside cat only. buh my dad felt bad leaving him in tha house all day. so we let him outside to do wuh cats do.(this was on tha 6th) he didnt show up til tha 9th buh when he did come back he came back dirty and beat up. it looked like he got in a lot of fights. tha cuts werent bad and they're healed now. buh now he cant meow ): he trys and no sound s out and he is losing weight. i can feel his bones a little bit. were taking him to tha vet 2mrw buh i wanna know things in advanced. any ideas in wuts wrong with him?? im worried :/