A male or female that is sexually desirable to a male/female. Whether through a personality or physical appearance.
EX:
Sean-Look at my awesome six pack Robin and Kayli!
Robin and Kayli-Wow, what a nice six pack, you are such a HOTTIE!
Sean-Heck yeah, its all natural.
Hawty/ Haughty/ Hottie are all slangs derived from the English word 'Hot'. They basically describe the appearance of someone.
The literal meaning is Sultry: Sexually attractive.
Person A (guy): 'You are nothing but a hottie.' (He means she is very attractive. He does not mean that she has a high temperature.)
Person B (the attractive girl): 'You flatter me.'