ass ➜  ~ alias gcb="echo 'Fuck you' && git checkout -b"
ass ➜  ~ man alias
ass ➜  ~ mkdir test
ass ➜  ~ cd test
ass ➜  test git init
Initialized empty Git repository in /Users/romcheg/test/.git/
ass ➜  test git:(master) gcb new-branch
Fuck you
Switched to a new branch 'new-branch'
ass ➜  test git:(new-branch)