Create new repo on Bitbucket from Git Bash terminal?

https://confluence.atlassian.com/bitbucket/repository-resource-423626331.html

$ curl -X POST -v -u username:password -H "Content-Type: application/json" \
  https://api.bitbucket.org/2.0/repositories/teamsinspace/new-repository4 \
  -d '{"scm": "git", "is_private": "true", "fork_policy": "no_public_forks" }'

Here is @hannesr's script tweaked a bit to accept input from prompts:

# startbitbucket - creates remote bitbucket repo and adds it as git remote to cwd
function startbitbucket {
    echo 'Username?'
    read username
    echo 'Password?'
    read -s password  # -s flag hides password text
    echo 'Repo name?'
    read reponame

    curl --user $username:$password \
         https://api.bitbucket.org/1.0/repositories/ \
         --data name=$reponame \
         --data is_private='true'
    git remote add origin [email protected]:$username/$reponame.git
    git push -u origin --all
    git push -u origin --tags
}

You should place this in your .bashrc or .bash_aliases.

You can use the Bitbucket REST API and cURL. For example:

curl --user login:pass https://api.bitbucket.org/1.0/repositories/ \
--data name=REPO_NAME

to create new repository named REPO_NAME.

See Use the Bitbucket REST APIs for more information.

UPDATE

For Bitbucket V2 specifically, see POST a new repo