"bla bla bla..."

bla bla bla...
its always there when we're talking about uninteresting stuff or when we're trying to say "shut up", or "i dont care about what you're saying" or "she/he talks too much"...

we always use the "bla bla bla" expression!
why not fla fla fla or tra tra tra or bra bra bra or...???

ok, im gona stop my bla bla bla now and go do something better! ;)