I have a black belt in taekwondo, but how can I use this to DHV without bragging or appearing big headed.

Im sure if it can, unless you have the skills of jackie clan or somethin. Actually you can by showing them some simple self defense moves.
I used to do tae kwon do, but i left after reaching blue belt red tag, i used to spar with fully grown men, so when it came to fighting black belts my own age at other places, i would kick their ass silly, i was abit of a street fighter too, so i suppose that helped.

Same here I take tae kwon do but not black belt. showing self defense techniques that are easy to perform and dont require lots of strength will be big DHV since you show that you can take care of your business and protect their fragile bodies

You can use it to DHV by taking care of AMOGs, if there is an asshole around you can kick his ass. Other than that don't expect too much.

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I dunno..

It's like saying you train MMA.. I mean, who -doesn't- train MMA?

Just don't be lame and wear a Tapout t-shirt.

I knew a guy who had similar martial arts skills.

He just threw it into stories of how he used this move or that move to kick a guys ass. And how his friends were equally tough, and how this chode was annoying this girl etc. Use it for the protector of loved ones switch.

Knowing simple grip breaks and things that you would teach beginners or women in a self defence glass are a GREAT way to initiate or escalate kino. If you can teach her the moves you automatically put yourself into a position of authority where she is doing what you tell her to do.

The girls have to be in the right mood to do it, but once they start they usually really enjoy it

Hrm this should be a great idea inyour head for escelating kino also you could bring it about in a joking manner and almost make fun of it OR tell a funny story from your class OR make up a funny story about one of your students in your class just bring it up in a way that makes it look like you aren't bragging that you are just bringing it up in random conversation maybe you see a guy in the club and say "omg that guy over there looks just like this goofball student of mine" and naturally they will ask what you teach even if you don't teach tae kwon do you have probably given pointers to people in your class and you can always offer to give the ladies pointers

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Ok search youtube or google for a programme called 'mind, body and kick ass moves'. He sets great examples of how you can turn martial arts in a routine.