mine's called cdd, and it's a little more complex:

    cdd () {
      case "$1" in
        */..|*/../) cd -- "$1";; # that doesn't make any sense unless the directory already exists
        /*/../*) (cd "${1%/../*}/.." && mkdir -p "./${1##*/../}") && cd -- "$1";;
        /*) mkdir -p "$1" && cd "$1";;
        */../*) (cd "./${1%/../*}/.." && mkdir -p "./${1##*/../}") && cd "./$1";;
        ../*) (cd .. && mkdir -p "${1#.}") && cd "$1";;
        *) mkdir -p "./$1" && cd "./$1";;
      esac
    }

https://unix.stackexchange.com/a/9124/4791

Same here. I call it mkcd

oh yea, slight name difference:

    alias mkdir='mkdir -pv'
    function take() {
      mkdir $1
      cd $1
    }

i'm going to steal that cdtemp function though