What is Partner In Crime?
1.
good friends who get in trouble together or get each other in trouble and laugh about it.
we always get in trouble together. you're my partner in crime!
See
2.
your significant other; someone you can depend on to help you get shit done! Your Boo
Whew, I'm glad we finally finished that project! Gimme five my "partner in crime"! Crime meaning a good thing philosophically speaking.