Zappadong remids me at an alternative section. (Does the "alternative" sector still exists in the record store, or is it now all "gothic" or "independent"?) It remindes me at Frank Zappa, old comics like "ZACK!" or Zack de la Rocha. So in this attitude I find the idea of MPQ "zappadong - think about it" best.
But this idea would not fit in the life route of fogman "from HIV to MillionDollarBaby". I would personally dont interprete Zappadong with a underline. I would not route any interpretation.
I would prefer a comic style "Zappadong" with a big "!", rounded with a comic flash ...like

alpha got it - whoever else?

Think of Don Martin (MAD). And the sound that makes a big fat 16tons weight,
or some strange mechanical mimik at work.
Unfortunately, 16tons is taken since 1984.

ZITZAFITZ...BAZONG-FLAPPERADAPP!

Zappadong! - Trust us!
Zappadong! - Trust noone else!
Zappadong! - Games R us!
Zappadong! - im loving it (joke)
Zappadong! - step inside!
Zappadong! - your welcome!

Zappadong! - spielst du noch, oder zockst du schon? (wie würde man das in english sagen???)

Zappadong! - better than usual

Because I´m really keen about your support I´ve changed the disclaimer:
Even if I don´t use any slogan, I´ll choose the best fitting and the proclaimer will get the prize.

Zappadong! - more then meets the eye
Zappadong! - Games Improvement

clearly, im heaving fun at it

Zappadong, your kickstart!
Be smart, be Zappadong!
Zappadong, quality provided.
Zappadong gamedevelopment.
zappadong... games, dev and more.
Zappadong, spawning games since 2011

Zappadong - Games++
Zappadong - We create games, too
Zappadong - Bams!
Zappadong - From the frontier of games
Zappadong - Great without a slogan
Zappadong - We have beer
Zappadong - Oh look, games!
Zappadong - $slogan

Zappadong! - Look whos playing games
Zappadong! - our slogan is your opinion about us!
Zappadong! - Videogames nothing else
Zappadong! - the only Casual Game was yesterday

Zappadong! - Where Indies Beat Pros!

Adding some ZAP! back to your games, ZaPPaDonG!

Zappadong - adding a bit of ZAP to your gaming.

Feel the Game, Feel the Zap - ZaPPaDonG!

ZaPPaDonG! - FEEL the ZAP!

ZaPPaDonG! - ZAP your MIND!