つーか (tsuuka)

(...)tsuuka... 

means "but" or "to be honest" and so on.

For example:

A: このキャラクターかわいいよね。"Kono kyarakutaa kawaii yo ne. (This character is cute.)

B: うん。つーか、キャラクター興味ないし。"Un. Tsuuka kyarakutaa kyomi naishi." (Yes, but to be honest, I don't like characters though.)

You can also use this at the top of a sentence too- like 「つーか　これうまい」"tsuuka kore umai" (tsuuka this is yummy!).

In that case, you can jump in the conversation whether the sentence suits the atmosphere or not.