"No" or often "hell no". Kinda is used by people that are afraid to commit to a simple yes or no answer. If you can't say a definite "yes," then by default you are in fact saying no. This is especially true when it comes to relationships.
Katie: So do you have a girlfriend?
Cute Boy: Well, um...kinda.
Kinda - Means "A great deal" "Hell Yes" "Definitely" "No Doubt" "Absolute Certainty" but the user of the word is hesitant about commiting to the "Yes" word in order to protect their image or hide their true feelings.