is he giving me hints or something?

so i have this friend, and kind of as a joke i guess, he calls me "fatty" or chubby

and at no way at all is this friend mean and i love him to death,

but would he actually making fun of my weight?

yes

You're 5'6" and 110 lbs, so I doubt it.

He is giving you a hint... that you're very thin.  He's being sarcastic.  In the same way some people call their short friend 'lofty' or the tall friend 'shorty'.

He's deff. only being sarcastic. I call my bff fat ass and shes 5'7 size 2 probably around 130 ish.

Since we dont know the friend we cannot comment on whether he is sarcastic or not.  What I can comment on is the fact that it bothers you enough to set up a post about it. 

Talk to your friend.  Tell him/her that the comments baffles you.  Ask if he thinks you are fat (and btw, would it even matter?).  Although it is nice to have positive image comments from friends and family, it is within your being to bolster yourself up.  Give yourself motivational comments and tell yourself what a fantastic babe you really are!