this is a difficult word to define because what may be flirting to one person may not be to another. i guess, as a verb, it would be defined as intentionally trying to attract the attention of one you "like" using means that could be considered seductive.

to flirt is to do a small or large gestures to show someone likes another person

Any action that would cause an ordinary reasonable person (observer or participant) to believe that person A had feelings more than friends for person B

Playful banter usually, but not restricted, with members of the opposite sex. This usually includes a conscious desire to flatter the one being flirted with. Flirting is a core aspect of many relationships today between a boy and a girl.

Girls are often caught flirting with each other. In this context, it is usually not intended sexually but playfully.

Nearly all accounts of flirting include subtle sexual innuendos and, to the unexperienced, can sometimes seem harmless.

to make romantic and /or intimate advances and gestures at someone

You dinking around with the opposite sex. complements and shit

exaggerations or even lies on occasion used to make ones self look better and score so called brownie points later redeemed for sexual activities.