Guys what do you usually mean when you call a girl "hottie" ?

there is this guy that I started talking to, we are good friends.. and today I wore this really pretty oufit that I have. and on fb he was like hey there hottie :D why were you out of uniform 2day?

Does this mean something? would you tell a girl your interested in that? or do you just think she's got a nice body?
Guys what do you usually mean when you call a girl "hottie" ?
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