Seriously, man. Don't be a fucking tut tut. Just come to the beach with us.
"Look at that douche wearing an Ed Hardy t-shirt. Hes all like 'Tut tut, look at my super sweet expensive t-shirt, tut tut' ".
Can also be used as a verb. Ie:
Alf: Tut-tut, surely you need to know how to read first.
Serena: Quit Tut-tutting all my ideas asshole!