it is usually accompagnied by a hand gesture:
.put index finger under nose
.as soon as you say the word make as if you have a VERY STIFF moustache sticking out from under your nose in a thrusting motion with said finger
. alternatively, malke it that the imaginary moustache is curled at the end
The reason for this hand gesture: this is when you have become so retarded that you need to be sent to a insane asylum and your nostril hair start growing and/or curling
Gemma + Roadie: MEHHH!!!!
Gemma: *walks into a chair and APOLOGISES*
Zippy + roadie: *discreetly* mehhh