Question: how to flirt with a guy subtly?
Answer: Be calm and cool. Getting overexcited about talking to him or seeing him makes you seem 'weird'. ... 
Smile subtly, but don't go so wide your mouth hurts afterward. Helpful 2 Not Helpful 0.
Glance at him. ... 
Use body language by touching his arm or moving closer to him. ... 
Twirl your hair.