It is not recommended to tell dirty jokes when chasing girls because doing so may make girls feel uncomfortable or awkward. Girls may be more willing to accept positive and constructive ways to express their feelings and interests, such as chatting, sharing common interests, inviting people to do activities together, etc. to build relationships. When chasing a girl, you should respect her feelings and wishes, be sincere and polite, and not use inappropriate methods such as telling dirty jokes to attract her attention.