What does it mean when a guy says something about your lips?

I took a close up picture on Snapchat of my face from a lower below angle and i have full lips. This guy snaps me saying "them lips tho" i barely talk to this guy but he does compliment me here and there.. And he's older than me..
What do guys usually mean if they compliment your lips? Is it sexual or romantic? Ps I'm sure he knows about sex and all that lol..
What does it mean when a guy says something about your lips?
Post Opinion