What is It's What I Do?
1.
A phrase used when reciving a complement, is often used to avoid acqward moments. Or can be used to recive the complement in cocky fashion.
Girl: Wow I really like your hair.
Guy: Ya, it's what I do.
or
Friend: You totally sniped that dude.
Guy: Ya, it's what I do.
See
2.
Something that you find yourself doing repeatedly so it is your signature mark that is known by all
Yeah that was me who sniped you in COD4,It's What I Do
See