BuddyPress.org

Best way is to do it like this (for the logged in user):

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echo $bp['loggedin_domain'] . $bp['profile']['slug'];

echo $bp['loggedin_domain'] . $bp['messages']['slug'];

echo $bp['loggedin_domain'] . $bp['friends']['slug'];

echo $bp['loggedin_domain'] . $bp['groups']['slug'];

echo $bp['loggedin_domain'] . $bp['wire']['slug'];

echo $bp['loggedin_domain'] . $bp['activity']['slug'];

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If you put that code inside a function, make sure you global $bp; at the top.