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You can see the bindings and change them as you wish in turtlebot_teleop/scripts/turtlebot_teleop_key (see https://github.com/turtlebot/turtlebot/blob/indigo/turtlebot_teleop/scripts/turtlebot_teleop_key#L53)

For example, in binding 'm':(-1,-1), first element is x velocity, second one is angular velocity.

For your question,

'o':(1,-1),
'u':(1,1),

u makes TurleBot move forward and rotate counter clockwise, while o makes it forward and clockwise. Same thing applies for m and . and others.