sarcastic clap 

A clap that is done to belittle and make fun of someone.
Usually done very slowly; 1 second or more between each clap.

Guy 1: Hey what did Mr. Peach do when you read your essay in front of the class?

Guy 2: He started sarcastic clapping, that asshole.

sarcastic clap by ThisFoo December 30, 2010

sarcasticlap 

A slow clap created in situations of extreme sarcasm or when sarcasm is due.
Also applicable to ironic or satirical situations.

After the dead silence sat for a while following Nancy's horrible joke, I felt a sarcasticlap was in order and did so deliver.

Clap.........Clap.........clap.

sarcasticlap by TheFloyd April 17, 2008