Spasm.
When you are angry and you need to punch something.. you punch the keyboard and a spasm comes out.
Or when you are bored you just do spasms.
Spasm. :vbhcjdbvjhuebgfvhdusgvbfhdskbvhdukwgvbfjvhjbsdplenbfhdbvhbjhfjdbgvruhfbwuqvbfuywbvfukwvbhfuwekgfuvgbuwgfvbuw etc.

Katherine: She is being such a bitch 
Tilly: innaaaat
Katherine ARGH jcjunmjvdbhwq,mgew