1. A challenge: It's a playful or daring statement that invites someone to try to catch or apprehend the speaker. It suggests the speaker is quick, agile, or elusive, and that the other person will have a difficult time doing so.
2. A taunt: It can be used to mock someone, implying that they are not capable of catching the speaker.
3. A statement of freedom: It can express a sense of liberation and independence, suggesting that the speaker is free to do as they please, without being restrained.
4. A reference to the movie: It's also the title of a famous 2002 film starring Leonardo DiCaprio and Tom Hanks, which is based on the true story of Frank Abagnale Jr., a con artist who impersonated an airline pilot, doctor, and lawyer.
The meaning of the phrase depends on the context in which it is used.