Faaff - A sound that comes out of your mouth when you're too lazy to

A sound that comes out of your mouth when you're too lazy to say the whole word. It’s like a mini curse.

I said 'Faaff' to my friend when he kept interrupting me.

I said 'Faaff' to my dog when he barked at my mom.

I said 'Faaff' to my teacher when she gave me a bad grade.