A non-verbal sound produced by the vibration of the lower lip against the tongue using air either exhaled or squeezed by the cheeks. It is denoted frequenty in text conversations (either interactive or offline message protocols) as 'thppppt'. The number of "p"s indicates severity.
You don't frighten us, English pig-dogs! Go and boil your bottom, sons of a silly person. I blow my nose at you, so-called Arthur King, you and all your silly English k-nnnnniggets. Thpppppt! Thppt! Thppt!